Finding the Fourth Proportional to 78,642, 108,524.76 and 42,831.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78,642 : 108,524.76 = 42,831.12 : x
2. Step 2: Convert to fraction form
   78,642/108,524.76 = 42,831.12/x
3. Step 3: Cross multiply
   78,642x = 108,524.76 × 42,831.12
4. Step 4: Simplify right side
   78,642x = 4,648,237,018.53
5. Step 5: Solve for x
   x = 4,648,237,018.53/78,642
6. Step 6: Final answer
   x = 59,106.29