Finding the Fourth Proportional to 78,554.67, 117,863.25 and 28,638.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,554.67 : 117,863.25 = 28,638.15 : x
2. Step 2: Convert to fraction form
   78,554.67/117,863.25 = 28,638.15/x
3. Step 3: Cross multiply
   78,554.67x = 117,863.25 × 28,638.15
4. Step 4: Simplify right side
   78,554.67x = 3,375,385,432.99
5. Step 5: Solve for x
   x = 3,375,385,432.99/78,554.67
6. Step 6: Final answer
   x = 42,968.62