Finding the Fourth Proportional to 78,540.66, 108,387.18 and 42,731.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,540.66 : 108,387.18 = 42,731.10 : x
2. Step 2: Convert to fraction form
   78,540.66/108,387.18 = 42,731.10/x
3. Step 3: Cross multiply
   78,540.66x = 108,387.18 × 42,731.10
4. Step 4: Simplify right side
   78,540.66x = 4,631,503,427.30
5. Step 5: Solve for x
   x = 4,631,503,427.30/78,540.66
6. Step 6: Final answer
   x = 58,969.50