Finding the Fourth Proportional to 1,090.56, 1,486.08 and 1,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.56 : 1,486.08 = 1,086.72 : x
2. Step 2: Convert to fraction form
   1,090.56/1,486.08 = 1,086.72/x
3. Step 3: Cross multiply
   1,090.56x = 1,486.08 × 1,086.72
4. Step 4: Simplify right side
   1,090.56x = 1,614,952.86
5. Step 5: Solve for x
   x = 1,614,952.86/1,090.56
6. Step 6: Final answer
   x = 1,480.85