Finding the Fourth Proportional to 9,921.06, 14,856.98 and 8,284.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,921.06 : 14,856.98 = 8,284.86 : x
2. Step 2: Convert to fraction form
   9,921.06/14,856.98 = 8,284.86/x
3. Step 3: Cross multiply
   9,921.06x = 14,856.98 × 8,284.86
4. Step 4: Simplify right side
   9,921.06x = 123,087,957.90
5. Step 5: Solve for x
   x = 123,087,957.90/9,921.06
6. Step 6: Final answer
   x = 12,406.73