Finding the Fourth Proportional to 78,238.92, 107,969.70 and 42,429

Step by Step Solution

1. Step 1: Write the proportion equation
   78,238.92 : 107,969.70 = 42,429 : x
2. Step 2: Convert to fraction form
   78,238.92/107,969.70 = 42,429/x
3. Step 3: Cross multiply
   78,238.92x = 107,969.70 × 42,429
4. Step 4: Simplify right side
   78,238.92x = 4,581,046,401.30
5. Step 5: Solve for x
   x = 4,581,046,401.30/78,238.92
6. Step 6: Final answer
   x = 58,552.01