Finding the Fourth Proportional to 14,426.64, 19,906.56 and 9,128.70

Step by Step Solution

1. Step 1: Write the proportion equation
   14,426.64 : 19,906.56 = 9,128.70 : x
2. Step 2: Convert to fraction form
   14,426.64/19,906.56 = 9,128.70/x
3. Step 3: Cross multiply
   14,426.64x = 19,906.56 × 9,128.70
4. Step 4: Simplify right side
   14,426.64x = 181,721,014.27
5. Step 5: Solve for x
   x = 181,721,014.27/14,426.64
6. Step 6: Final answer
   x = 12,596.21