Finding the Fourth Proportional to 51,991,064.51, 71,749,910.52 and 28,786,191.31

Step by Step Solution

1. Step 1: Write the proportion equation
   51,991,064.51 : 71,749,910.52 = 28,786,191.31 : x
2. Step 2: Convert to fraction form
   51,991,064.51/71,749,910.52 = 28,786,191.31/x
3. Step 3: Cross multiply
   51,991,064.51x = 71,749,910.52 × 28,786,191.31
4. Step 4: Simplify right side
   51,991,064.51x = 2,065,406,650,201,421
5. Step 5: Solve for x
   x = 2,065,406,650,201,421/51,991,064.51
6. Step 6: Final answer
   x = 39,726,185.06