Finding the Fourth Proportional to 1,047.17, 1,445.78 and 715.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.17 : 1,445.78 = 715.48 : x
2. Step 2: Convert to fraction form
   1,047.17/1,445.78 = 715.48/x
3. Step 3: Cross multiply
   1,047.17x = 1,445.78 × 715.48
4. Step 4: Simplify right side
   1,047.17x = 1,034,426.67
5. Step 5: Solve for x
   x = 1,034,426.67/1,047.17
6. Step 6: Final answer
   x = 987.83