Finding the Fourth Proportional to 1,088.52, 1,502.78 and 716.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.52 : 1,502.78 = 716.58 : x
2. Step 2: Convert to fraction form
   1,088.52/1,502.78 = 716.58/x
3. Step 3: Cross multiply
   1,088.52x = 1,502.78 × 716.58
4. Step 4: Simplify right side
   1,088.52x = 1,076,871.82
5. Step 5: Solve for x
   x = 1,076,871.82/1,088.52
6. Step 6: Final answer
   x = 989.30