Finding the Fourth Proportional to 78,638.18, 108,521.98 and 42,828.89

Step by Step Solution

1. Step 1: Write the proportion equation
   78,638.18 : 108,521.98 = 42,828.89 : x
2. Step 2: Convert to fraction form
   78,638.18/108,521.98 = 42,828.89/x
3. Step 3: Cross multiply
   78,638.18x = 108,521.98 × 42,828.89
4. Step 4: Simplify right side
   78,638.18x = 4,647,875,294.32
5. Step 5: Solve for x
   x = 4,647,875,294.32/78,638.18
6. Step 6: Final answer
   x = 59,104.57