Finding the Fourth Proportional to 102,061.34, 140,845.40 and 56,121.78

Step by Step Solution

1. Step 1: Write the proportion equation
   102,061.34 : 140,845.40 = 56,121.78 : x
2. Step 2: Convert to fraction form
   102,061.34/140,845.40 = 56,121.78/x
3. Step 3: Cross multiply
   102,061.34x = 140,845.40 × 56,121.78
4. Step 4: Simplify right side
   102,061.34x = 7,904,494,552.81
5. Step 5: Solve for x
   x = 7,904,494,552.81/102,061.34
6. Step 6: Final answer
   x = 77,448.47