Finding the Fourth Proportional to 78,217.50, 107,940.52 and 42,407.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,217.50 : 107,940.52 = 42,407.40 : x
2. Step 2: Convert to fraction form
   78,217.50/107,940.52 = 42,407.40/x
3. Step 3: Cross multiply
   78,217.50x = 107,940.52 × 42,407.40
4. Step 4: Simplify right side
   78,217.50x = 4,577,476,807.85
5. Step 5: Solve for x
   x = 4,577,476,807.85/78,217.50
6. Step 6: Final answer
   x = 58,522.41