Finding the Fourth Proportional to 1,047.30, 1,445.27 and 715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.30 : 1,445.27 = 715.72 : x
2. Step 2: Convert to fraction form
   1,047.30/1,445.27 = 715.72/x
3. Step 3: Cross multiply
   1,047.30x = 1,445.27 × 715.72
4. Step 4: Simplify right side
   1,047.30x = 1,034,406.82
5. Step 5: Solve for x
   x = 1,034,406.82/1,047.30
6. Step 6: Final answer
   x = 987.69