Finding the Fourth Proportional to 8,440.86, 12,718.43 and 7,012.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,440.86 : 12,718.43 = 7,012.02 : x
2. Step 2: Convert to fraction form
   8,440.86/12,718.43 = 7,012.02/x
3. Step 3: Cross multiply
   8,440.86x = 12,718.43 × 7,012.02
4. Step 4: Simplify right side
   8,440.86x = 89,181,850.47
5. Step 5: Solve for x
   x = 89,181,850.47/8,440.86
6. Step 6: Final answer
   x = 10,565.49