Finding the Fourth Proportional to 78,142.68, 107,836.38 and 42,331.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78,142.68 : 107,836.38 = 42,331.86 : x
2. Step 2: Convert to fraction form
   78,142.68/107,836.38 = 42,331.86/x
3. Step 3: Cross multiply
   78,142.68x = 107,836.38 × 42,331.86
4. Step 4: Simplify right side
   78,142.68x = 4,564,914,541.07
5. Step 5: Solve for x
   x = 4,564,914,541.07/78,142.68
6. Step 6: Final answer
   x = 58,417.69