Finding the Fourth Proportional to 78,494.30, 108,324.18 and 42,686.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,494.30 : 108,324.18 = 42,686.40 : x
2. Step 2: Convert to fraction form
   78,494.30/108,324.18 = 42,686.40/x
3. Step 3: Cross multiply
   78,494.30x = 108,324.18 × 42,686.40
4. Step 4: Simplify right side
   78,494.30x = 4,623,969,277.15
5. Step 5: Solve for x
   x = 4,623,969,277.15/78,494.30
6. Step 6: Final answer
   x = 58,908.34