Finding the Fourth Proportional to 10,085.72, 15,120.37 and 7,904.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,085.72 : 15,120.37 = 7,904.18 : x
2. Step 2: Convert to fraction form
   10,085.72/15,120.37 = 7,904.18/x
3. Step 3: Cross multiply
   10,085.72x = 15,120.37 × 7,904.18
4. Step 4: Simplify right side
   10,085.72x = 119,514,173.83
5. Step 5: Solve for x
   x = 119,514,173.83/10,085.72
6. Step 6: Final answer
   x = 11,849.85