Finding the Fourth Proportional to 78,418.40, 108,217.21 and 42,608.55

Step by Step Solution

1. Step 1: Write the proportion equation
   78,418.40 : 108,217.21 = 42,608.55 : x
2. Step 2: Convert to fraction form
   78,418.40/108,217.21 = 42,608.55/x
3. Step 3: Cross multiply
   78,418.40x = 108,217.21 × 42,608.55
4. Step 4: Simplify right side
   78,418.40x = 4,610,978,190.10
5. Step 5: Solve for x
   x = 4,610,978,190.10/78,418.40
6. Step 6: Final answer
   x = 58,799.70