Finding the Fourth Proportional to 12,380.21, 17,079.32 and 8,287.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,380.21 : 17,079.32 = 8,287.10 : x
2. Step 2: Convert to fraction form
   12,380.21/17,079.32 = 8,287.10/x
3. Step 3: Cross multiply
   12,380.21x = 17,079.32 × 8,287.10
4. Step 4: Simplify right side
   12,380.21x = 141,538,032.77
5. Step 5: Solve for x
   x = 141,538,032.77/12,380.21
6. Step 6: Final answer
   x = 11,432.60