Finding the Fourth Proportional to 23,158.72, 31,964.16 and 13,602.88

Step by Step Solution

1. Step 1: Write the proportion equation
   23,158.72 : 31,964.16 = 13,602.88 : x
2. Step 2: Convert to fraction form
   23,158.72/31,964.16 = 13,602.88/x
3. Step 3: Cross multiply
   23,158.72x = 31,964.16 × 13,602.88
4. Step 4: Simplify right side
   23,158.72x = 434,804,632.78
5. Step 5: Solve for x
   x = 434,804,632.78/23,158.72
6. Step 6: Final answer
   x = 18,774.99