Finding the Fourth Proportional to 78,217.15, 107,940.18 and 42,407.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78,217.15 : 107,940.18 = 42,407.71 : x
2. Step 2: Convert to fraction form
   78,217.15/107,940.18 = 42,407.71/x
3. Step 3: Cross multiply
   78,217.15x = 107,940.18 × 42,407.71
4. Step 4: Simplify right side
   78,217.15x = 4,577,495,850.79
5. Step 5: Solve for x
   x = 4,577,495,850.79/78,217.15
6. Step 6: Final answer
   x = 58,522.92