Finding the Fourth Proportional to 1,086.56, 1,499.60 and 667.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.56 : 1,499.60 = 667.16 : x
2. Step 2: Convert to fraction form
   1,086.56/1,499.60 = 667.16/x
3. Step 3: Cross multiply
   1,086.56x = 1,499.60 × 667.16
4. Step 4: Simplify right side
   1,086.56x = 1,000,473.14
5. Step 5: Solve for x
   x = 1,000,473.14/1,086.56
6. Step 6: Final answer
   x = 920.77