Finding the Fourth Proportional to 51,517.94, 77,287.98 and 15,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,517.94 : 77,287.98 = 15,978.50 : x
2. Step 2: Convert to fraction form
   51,517.94/77,287.98 = 15,978.50/x
3. Step 3: Cross multiply
   51,517.94x = 77,287.98 × 15,978.50
4. Step 4: Simplify right side
   51,517.94x = 1,234,945,988.43
5. Step 5: Solve for x
   x = 1,234,945,988.43/51,517.94
6. Step 6: Final answer
   x = 23,971.18