Finding the Fourth Proportional to 51,644.31, 71,263.29 and 28,978.62

Step by Step Solution

1. Step 1: Write the proportion equation
   51,644.31 : 71,263.29 = 28,978.62 : x
2. Step 2: Convert to fraction form
   51,644.31/71,263.29 = 28,978.62/x
3. Step 3: Cross multiply
   51,644.31x = 71,263.29 × 28,978.62
4. Step 4: Simplify right side
   51,644.31x = 2,065,111,800.86
5. Step 5: Solve for x
   x = 2,065,111,800.86/51,644.31
6. Step 6: Final answer
   x = 39,987.21