Finding the Fourth Proportional to 1,088.16, 1,501.86 and 646.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.16 : 1,501.86 = 646.31 : x
2. Step 2: Convert to fraction form
   1,088.16/1,501.86 = 646.31/x
3. Step 3: Cross multiply
   1,088.16x = 1,501.86 × 646.31
4. Step 4: Simplify right side
   1,088.16x = 970,659.63
5. Step 5: Solve for x
   x = 970,659.63/1,088.16
6. Step 6: Final answer
   x = 892.02