Finding the Fourth Proportional to 1,088.55, 1,502.31 and 646.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.55 : 1,502.31 = 646.56 : x
2. Step 2: Convert to fraction form
   1,088.55/1,502.31 = 646.56/x
3. Step 3: Cross multiply
   1,088.55x = 1,502.31 × 646.56
4. Step 4: Simplify right side
   1,088.55x = 971,333.55
5. Step 5: Solve for x
   x = 971,333.55/1,088.55
6. Step 6: Final answer
   x = 892.32