Finding the Fourth Proportional to 77,092.48, 115,429.92 and 40,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   77,092.48 : 115,429.92 = 40,078.72 : x
2. Step 2: Convert to fraction form
   77,092.48/115,429.92 = 40,078.72/x
3. Step 3: Cross multiply
   77,092.48x = 115,429.92 × 40,078.72
4. Step 4: Simplify right side
   77,092.48x = 4,626,283,443.30
5. Step 5: Solve for x
   x = 4,626,283,443.30/77,092.48
6. Step 6: Final answer
   x = 60,009.53