Finding the Fourth Proportional to 8,663.76, 11,930.81 and 7,528.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,663.76 : 11,930.81 = 7,528.91 : x
2. Step 2: Convert to fraction form
   8,663.76/11,930.81 = 7,528.91/x
3. Step 3: Cross multiply
   8,663.76x = 11,930.81 × 7,528.91
4. Step 4: Simplify right side
   8,663.76x = 89,825,897.42
5. Step 5: Solve for x
   x = 89,825,897.42/8,663.76
6. Step 6: Final answer
   x = 10,368.00