Finding the Fourth Proportional to 23,288.72, 32,139.28 and 12,678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,288.72 : 32,139.28 = 12,678.72 : x
2. Step 2: Convert to fraction form
   23,288.72/32,139.28 = 12,678.72/x
3. Step 3: Cross multiply
   23,288.72x = 32,139.28 × 12,678.72
4. Step 4: Simplify right side
   23,288.72x = 407,484,932.12
5. Step 5: Solve for x
   x = 407,484,932.12/23,288.72
6. Step 6: Final answer
   x = 17,497.09