Finding the Fourth Proportional to 15,854,123,971.36, 21,858,381,119.59 and 12,985,699,074.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,854,123,971.36 : 21,858,381,119.59 = 12,985,699,074.71 : x
2. Step 2: Convert to fraction form
   15,854,123,971.36/21,858,381,119.59 = 12,985,699,074.71/x
3. Step 3: Cross multiply
   15,854,123,971.36x = 21,858,381,119.59 × 12,985,699,074.71
4. Step 4: Simplify right side
   15,854,123,971.36x = 283,846,359,479,318,380,544
5. Step 5: Solve for x
   x = 283,846,359,479,318,380,544/15,854,123,971.36
6. Step 6: Final answer
   x = 17,903,629,364.33