Finding the Fourth Proportional to 78,641.31, 108,526.26 and 42,831.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,641.31 : 108,526.26 = 42,831.30 : x
2. Step 2: Convert to fraction form
   78,641.31/108,526.26 = 42,831.30/x
3. Step 3: Cross multiply
   78,641.31x = 108,526.26 × 42,831.30
4. Step 4: Simplify right side
   78,641.31x = 4,648,320,799.94
5. Step 5: Solve for x
   x = 4,648,320,799.94/78,641.31
6. Step 6: Final answer
   x = 59,107.88