Finding the Fourth Proportional to 78,638.95, 108,522.99 and 42,828.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,638.95 : 108,522.99 = 42,828.94 : x
2. Step 2: Convert to fraction form
   78,638.95/108,522.99 = 42,828.94/x
3. Step 3: Cross multiply
   78,638.95x = 108,522.99 × 42,828.94
4. Step 4: Simplify right side
   78,638.95x = 4,647,924,463.10
5. Step 5: Solve for x
   x = 4,647,924,463.10/78,638.95
6. Step 6: Final answer
   x = 59,104.61