Finding the Fourth Proportional to 78,391.30, 117,500.55 and 43,356.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,391.30 : 117,500.55 = 43,356.10 : x
2. Step 2: Convert to fraction form
   78,391.30/117,500.55 = 43,356.10/x
3. Step 3: Cross multiply
   78,391.30x = 117,500.55 × 43,356.10
4. Step 4: Simplify right side
   78,391.30x = 5,094,365,595.86
5. Step 5: Solve for x
   x = 5,094,365,595.86/78,391.30
6. Step 6: Final answer
   x = 64,986.36