Finding the Fourth Proportional to 78,139.87, 107,833.30 and 42,329.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,139.87 : 107,833.30 = 42,329.79 : x
2. Step 2: Convert to fraction form
   78,139.87/107,833.30 = 42,329.79/x
3. Step 3: Cross multiply
   78,139.87x = 107,833.30 × 42,329.79
4. Step 4: Simplify right side
   78,139.87x = 4,564,560,838.18
5. Step 5: Solve for x
   x = 4,564,560,838.18/78,139.87
6. Step 6: Final answer
   x = 58,415.26