Finding the Fourth Proportional to 10,902.60, 15,012.27 and 8,217.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,902.60 : 15,012.27 = 8,217.72 : x
2. Step 2: Convert to fraction form
   10,902.60/15,012.27 = 8,217.72/x
3. Step 3: Cross multiply
   10,902.60x = 15,012.27 × 8,217.72
4. Step 4: Simplify right side
   10,902.60x = 123,366,631.42
5. Step 5: Solve for x
   x = 123,366,631.42/10,902.60
6. Step 6: Final answer
   x = 11,315.34