Finding the Fourth Proportional to 1,088.28, 1,501.61 and 668.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.28 : 1,501.61 = 668.70 : x
2. Step 2: Convert to fraction form
   1,088.28/1,501.61 = 668.70/x
3. Step 3: Cross multiply
   1,088.28x = 1,501.61 × 668.70
4. Step 4: Simplify right side
   1,088.28x = 1,004,123.26
5. Step 5: Solve for x
   x = 1,004,123.26/1,088.28
6. Step 6: Final answer
   x = 922.67