Finding the Fourth Proportional to 78,128.52, 107,817.16 and 42,318.62

Step by Step Solution

1. Step 1: Write the proportion equation
   78,128.52 : 107,817.16 = 42,318.62 : x
2. Step 2: Convert to fraction form
   78,128.52/107,817.16 = 42,318.62/x
3. Step 3: Cross multiply
   78,128.52x = 107,817.16 × 42,318.62
4. Step 4: Simplify right side
   78,128.52x = 4,562,673,423.52
5. Step 5: Solve for x
   x = 4,562,673,423.52/78,128.52
6. Step 6: Final answer
   x = 58,399.59