Finding the Fourth Proportional to 12,820.27, 17,687.02 and 9,471.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.27 : 17,687.02 = 9,471.13 : x
2. Step 2: Convert to fraction form
   12,820.27/17,687.02 = 9,471.13/x
3. Step 3: Cross multiply
   12,820.27x = 17,687.02 × 9,471.13
4. Step 4: Simplify right side
   12,820.27x = 167,516,065.73
5. Step 5: Solve for x
   x = 167,516,065.73/12,820.27
6. Step 6: Final answer
   x = 13,066.50