Finding the Fourth Proportional to 10,966.86, 15,120.55 and 9,152.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,966.86 : 15,120.55 = 9,152.49 : x
2. Step 2: Convert to fraction form
   10,966.86/15,120.55 = 9,152.49/x
3. Step 3: Cross multiply
   10,966.86x = 15,120.55 × 9,152.49
4. Step 4: Simplify right side
   10,966.86x = 138,390,636.91
5. Step 5: Solve for x
   x = 138,390,636.91/10,966.86
6. Step 6: Final answer
   x = 12,618.99