Finding the Fourth Proportional to 9,123.30, 12,591.18 and 7,628.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.30 : 12,591.18 = 7,628.58 : x
2. Step 2: Convert to fraction form
   9,123.30/12,591.18 = 7,628.58/x
3. Step 3: Cross multiply
   9,123.30x = 12,591.18 × 7,628.58
4. Step 4: Simplify right side
   9,123.30x = 96,052,823.92
5. Step 5: Solve for x
   x = 96,052,823.92/9,123.30
6. Step 6: Final answer
   x = 10,528.30