Finding the Fourth Proportional to 78,591.78, 108,456.68 and 42,782.07

Step by Step Solution

1. Step 1: Write the proportion equation
   78,591.78 : 108,456.68 = 42,782.07 : x
2. Step 2: Convert to fraction form
   78,591.78/108,456.68 = 42,782.07/x
3. Step 3: Cross multiply
   78,591.78x = 108,456.68 × 42,782.07
4. Step 4: Simplify right side
   78,591.78x = 4,640,000,655.10
5. Step 5: Solve for x
   x = 4,640,000,655.10/78,591.78
6. Step 6: Final answer
   x = 59,039.26