Finding the Fourth Proportional to 10,216.18, 14,120.49 and 9,428.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,216.18 : 14,120.49 = 9,428.86 : x
2. Step 2: Convert to fraction form
   10,216.18/14,120.49 = 9,428.86/x
3. Step 3: Cross multiply
   10,216.18x = 14,120.49 × 9,428.86
4. Step 4: Simplify right side
   10,216.18x = 133,140,123.34
5. Step 5: Solve for x
   x = 133,140,123.34/10,216.18
6. Step 6: Final answer
   x = 13,032.28