Finding the Fourth Proportional to 1,090.31, 1,484.50 and 1,086.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.31 : 1,484.50 = 1,086.85 : x
2. Step 2: Convert to fraction form
   1,090.31/1,484.50 = 1,086.85/x
3. Step 3: Cross multiply
   1,090.31x = 1,484.50 × 1,086.85
4. Step 4: Simplify right side
   1,090.31x = 1,613,423.39
5. Step 5: Solve for x
   x = 1,613,423.39/1,090.31
6. Step 6: Final answer
   x = 1,479.78