Finding the Fourth Proportional to 78,515.75, 108,353.96 and 42,708.05

Step by Step Solution

1. Step 1: Write the proportion equation
   78,515.75 : 108,353.96 = 42,708.05 : x
2. Step 2: Convert to fraction form
   78,515.75/108,353.96 = 42,708.05/x
3. Step 3: Cross multiply
   78,515.75x = 108,353.96 × 42,708.05
4. Step 4: Simplify right side
   78,515.75x = 4,627,585,586.07
5. Step 5: Solve for x
   x = 4,627,585,586.07/78,515.75
6. Step 6: Final answer
   x = 58,938.31