Finding the Fourth Proportional to 78,128.52, 107,817.15 and 42,318.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,128.52 : 107,817.15 = 42,318.63 : x
2. Step 2: Convert to fraction form
   78,128.52/107,817.15 = 42,318.63/x
3. Step 3: Cross multiply
   78,128.52x = 107,817.15 × 42,318.63
4. Step 4: Simplify right side
   78,128.52x = 4,562,674,078.50
5. Step 5: Solve for x
   x = 4,562,674,078.50/78,128.52
6. Step 6: Final answer
   x = 58,399.60