Finding the Fourth Proportional to 9,385.27, 12,918.79 and 8,499.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,385.27 : 12,918.79 = 8,499.53 : x
2. Step 2: Convert to fraction form
   9,385.27/12,918.79 = 8,499.53/x
3. Step 3: Cross multiply
   9,385.27x = 12,918.79 × 8,499.53
4. Step 4: Simplify right side
   9,385.27x = 109,803,686.09
5. Step 5: Solve for x
   x = 109,803,686.09/9,385.27
6. Step 6: Final answer
   x = 11,699.58