Finding the Fourth Proportional to 12,229.06, 16,870.10 and 7,978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,229.06 : 16,870.10 = 7,978.16 : x
2. Step 2: Convert to fraction form
   12,229.06/16,870.10 = 7,978.16/x
3. Step 3: Cross multiply
   12,229.06x = 16,870.10 × 7,978.16
4. Step 4: Simplify right side
   12,229.06x = 134,592,232.77
5. Step 5: Solve for x
   x = 134,592,232.77/12,229.06
6. Step 6: Final answer
   x = 11,005.93