Finding the Fourth Proportional to 12,486.30, 17,223.51 and 7,447.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,486.30 : 17,223.51 = 7,447.15 : x
2. Step 2: Convert to fraction form
   12,486.30/17,223.51 = 7,447.15/x
3. Step 3: Cross multiply
   12,486.30x = 17,223.51 × 7,447.15
4. Step 4: Simplify right side
   12,486.30x = 128,266,062.50
5. Step 5: Solve for x
   x = 128,266,062.50/12,486.30
6. Step 6: Final answer
   x = 10,272.54