Finding the Fourth Proportional to 74,200.78, 102,399.69 and 42,369.10

Step by Step Solution

1. Step 1: Write the proportion equation
   74,200.78 : 102,399.69 = 42,369.10 : x
2. Step 2: Convert to fraction form
   74,200.78/102,399.69 = 42,369.10/x
3. Step 3: Cross multiply
   74,200.78x = 102,399.69 × 42,369.10
4. Step 4: Simplify right side
   74,200.78x = 4,338,582,705.58
5. Step 5: Solve for x
   x = 4,338,582,705.58/74,200.78
6. Step 6: Final answer
   x = 58,470.85