Finding the Fourth Proportional to 1,089.35, 1,502.92 and 716.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.35 : 1,502.92 = 716.55 : x
2. Step 2: Convert to fraction form
   1,089.35/1,502.92 = 716.55/x
3. Step 3: Cross multiply
   1,089.35x = 1,502.92 × 716.55
4. Step 4: Simplify right side
   1,089.35x = 1,076,917.33
5. Step 5: Solve for x
   x = 1,076,917.33/1,089.35
6. Step 6: Final answer
   x = 988.59