Finding the Fourth Proportional to 1,090.72, 1,505.28 and 698.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.72 : 1,505.28 = 698.08 : x
2. Step 2: Convert to fraction form
   1,090.72/1,505.28 = 698.08/x
3. Step 3: Cross multiply
   1,090.72x = 1,505.28 × 698.08
4. Step 4: Simplify right side
   1,090.72x = 1,050,805.86
5. Step 5: Solve for x
   x = 1,050,805.86/1,090.72
6. Step 6: Final answer
   x = 963.41