Finding the Fourth Proportional to 9,121.62, 12,587.85 and 5,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.62 : 12,587.85 = 5,142.72 : x
2. Step 2: Convert to fraction form
   9,121.62/12,587.85 = 5,142.72/x
3. Step 3: Cross multiply
   9,121.62x = 12,587.85 × 5,142.72
4. Step 4: Simplify right side
   9,121.62x = 64,735,832.28
5. Step 5: Solve for x
   x = 64,735,832.28/9,121.62
6. Step 6: Final answer
   x = 7,096.97