Finding the Fourth Proportional to 9,121.65, 12,587.78 and 5,144.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.65 : 12,587.78 = 5,144.04 : x
2. Step 2: Convert to fraction form
   9,121.65/12,587.78 = 5,144.04/x
3. Step 3: Cross multiply
   9,121.65x = 12,587.78 × 5,144.04
4. Step 4: Simplify right side
   9,121.65x = 64,752,043.83
5. Step 5: Solve for x
   x = 64,752,043.83/9,121.65
6. Step 6: Final answer
   x = 7,098.72