Finding the Fourth Proportional to 78,638.10, 108,520.71 and 42,828.26

Step by Step Solution

1. Step 1: Write the proportion equation
   78,638.10 : 108,520.71 = 42,828.26 : x
2. Step 2: Convert to fraction form
   78,638.10/108,520.71 = 42,828.26/x
3. Step 3: Cross multiply
   78,638.10x = 108,520.71 × 42,828.26
4. Step 4: Simplify right side
   78,638.10x = 4,647,752,602.55
5. Step 5: Solve for x
   x = 4,647,752,602.55/78,638.10
6. Step 6: Final answer
   x = 59,103.06