Finding the Fourth Proportional to 1,502.78, 2,073.68 and 864.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,502.78 : 2,073.68 = 864.72 : x
2. Step 2: Convert to fraction form
   1,502.78/2,073.68 = 864.72/x
3. Step 3: Cross multiply
   1,502.78x = 2,073.68 × 864.72
4. Step 4: Simplify right side
   1,502.78x = 1,793,152.57
5. Step 5: Solve for x
   x = 1,793,152.57/1,502.78
6. Step 6: Final answer
   x = 1,193.22