Finding the Fourth Proportional to 78,448.55, 108,260.10 and 42,638.55

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.55 : 108,260.10 = 42,638.55 : x
2. Step 2: Convert to fraction form
   78,448.55/108,260.10 = 42,638.55/x
3. Step 3: Cross multiply
   78,448.55x = 108,260.10 × 42,638.55
4. Step 4: Simplify right side
   78,448.55x = 4,616,053,686.86
5. Step 5: Solve for x
   x = 4,616,053,686.86/78,448.55
6. Step 6: Final answer
   x = 58,841.80