Finding the Fourth Proportional to 1,047.72, 1,445.55 and 825.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.72 : 1,445.55 = 825.96 : x
2. Step 2: Convert to fraction form
   1,047.72/1,445.55 = 825.96/x
3. Step 3: Cross multiply
   1,047.72x = 1,445.55 × 825.96
4. Step 4: Simplify right side
   1,047.72x = 1,193,966.48
5. Step 5: Solve for x
   x = 1,193,966.48/1,047.72
6. Step 6: Final answer
   x = 1,139.59