Finding the Fourth Proportional to 78,638.34, 108,522.16 and 42,828.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,638.34 : 108,522.16 = 42,828.30 : x
2. Step 2: Convert to fraction form
   78,638.34/108,522.16 = 42,828.30/x
3. Step 3: Cross multiply
   78,638.34x = 108,522.16 × 42,828.30
4. Step 4: Simplify right side
   78,638.34x = 4,647,819,625.13
5. Step 5: Solve for x
   x = 4,647,819,625.13/78,638.34
6. Step 6: Final answer
   x = 59,103.74