Finding the Fourth Proportional to 1,090.12, 1,499.56 and 956.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.12 : 1,499.56 = 956.72 : x
2. Step 2: Convert to fraction form
   1,090.12/1,499.56 = 956.72/x
3. Step 3: Cross multiply
   1,090.12x = 1,499.56 × 956.72
4. Step 4: Simplify right side
   1,090.12x = 1,434,659.04
5. Step 5: Solve for x
   x = 1,434,659.04/1,090.12
6. Step 6: Final answer
   x = 1,316.06