Finding the Fourth Proportional to 78,641.78, 108,521.82 and 42,831.54

Step by Step Solution

1. Step 1: Write the proportion equation
   78,641.78 : 108,521.82 = 42,831.54 : x
2. Step 2: Convert to fraction form
   78,641.78/108,521.82 = 42,831.54/x
3. Step 3: Cross multiply
   78,641.78x = 108,521.82 × 42,831.54
4. Step 4: Simplify right side
   78,641.78x = 4,648,156,674.20
5. Step 5: Solve for x
   x = 4,648,156,674.20/78,641.78
6. Step 6: Final answer
   x = 59,105.44