Finding the Fourth Proportional to 31,153, 42,991.18 and 19,975

Step by Step Solution

1. Step 1: Write the proportion equation
   31,153 : 42,991.18 = 19,975 : x
2. Step 2: Convert to fraction form
   31,153/42,991.18 = 19,975/x
3. Step 3: Cross multiply
   31,153x = 42,991.18 × 19,975
4. Step 4: Simplify right side
   31,153x = 858,748,820.50
5. Step 5: Solve for x
   x = 858,748,820.50/31,153
6. Step 6: Final answer
   x = 27,565.53