Finding the Fourth Proportional to 1,090.72, 1,504.78 and 697.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.72 : 1,504.78 = 697.68 : x
2. Step 2: Convert to fraction form
   1,090.72/1,504.78 = 697.68/x
3. Step 3: Cross multiply
   1,090.72x = 1,504.78 × 697.68
4. Step 4: Simplify right side
   1,090.72x = 1,049,854.91
5. Step 5: Solve for x
   x = 1,049,854.91/1,090.72
6. Step 6: Final answer
   x = 962.53