Finding the Fourth Proportional to 16,621.72, 22,926.55 and 9,902.17

Step by Step Solution

1. Step 1: Write the proportion equation
   16,621.72 : 22,926.55 = 9,902.17 : x
2. Step 2: Convert to fraction form
   16,621.72/22,926.55 = 9,902.17/x
3. Step 3: Cross multiply
   16,621.72x = 22,926.55 × 9,902.17
4. Step 4: Simplify right side
   16,621.72x = 227,022,595.61
5. Step 5: Solve for x
   x = 227,022,595.61/16,621.72
6. Step 6: Final answer
   x = 13,658.19