Finding the Fourth Proportional to 8,630.82, 12,948.30 and 5,123.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,630.82 : 12,948.30 = 5,123.88 : x
2. Step 2: Convert to fraction form
   8,630.82/12,948.30 = 5,123.88/x
3. Step 3: Cross multiply
   8,630.82x = 12,948.30 × 5,123.88
4. Step 4: Simplify right side
   8,630.82x = 66,345,535.40
5. Step 5: Solve for x
   x = 66,345,535.40/8,630.82
6. Step 6: Final answer
   x = 7,687.05