Finding the Fourth Proportional to 78,122.50, 107,809.47 and 42,312.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,122.50 : 107,809.47 = 42,312.61 : x
2. Step 2: Convert to fraction form
   78,122.50/107,809.47 = 42,312.61/x
3. Step 3: Cross multiply
   78,122.50x = 107,809.47 × 42,312.61
4. Step 4: Simplify right side
   78,122.50x = 4,561,700,058.42
5. Step 5: Solve for x
   x = 4,561,700,058.42/78,122.50
6. Step 6: Final answer
   x = 58,391.63