Finding the Fourth Proportional to 2,042.50, 3,061.36 and 872.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,042.50 : 3,061.36 = 872.15 : x
2. Step 2: Convert to fraction form
   2,042.50/3,061.36 = 872.15/x
3. Step 3: Cross multiply
   2,042.50x = 3,061.36 × 872.15
4. Step 4: Simplify right side
   2,042.50x = 2,669,965.12
5. Step 5: Solve for x
   x = 2,669,965.12/2,042.50
6. Step 6: Final answer
   x = 1,307.20