Finding the Fourth Proportional to 16,964.72, 23,412.72 and 9,412.88

Step by Step Solution

1. Step 1: Write the proportion equation
   16,964.72 : 23,412.72 = 9,412.88 : x
2. Step 2: Convert to fraction form
   16,964.72/23,412.72 = 9,412.88/x
3. Step 3: Cross multiply
   16,964.72x = 23,412.72 × 9,412.88
4. Step 4: Simplify right side
   16,964.72x = 220,381,123.83
5. Step 5: Solve for x
   x = 220,381,123.83/16,964.72
6. Step 6: Final answer
   x = 12,990.55