Finding the Fourth Proportional to 51,042.71, 76,557.98 and 13,605.59

Step by Step Solution

1. Step 1: Write the proportion equation
   51,042.71 : 76,557.98 = 13,605.59 : x
2. Step 2: Convert to fraction form
   51,042.71/76,557.98 = 13,605.59/x
3. Step 3: Cross multiply
   51,042.71x = 76,557.98 × 13,605.59
4. Step 4: Simplify right side
   51,042.71x = 1,041,616,138.33
5. Step 5: Solve for x
   x = 1,041,616,138.33/51,042.71
6. Step 6: Final answer
   x = 20,406.76