Finding the Fourth Proportional to 1,686.72, 2,326.89 and 1,089.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.72 : 2,326.89 = 1,089.06 : x
2. Step 2: Convert to fraction form
   1,686.72/2,326.89 = 1,089.06/x
3. Step 3: Cross multiply
   1,686.72x = 2,326.89 × 1,089.06
4. Step 4: Simplify right side
   1,686.72x = 2,534,122.82
5. Step 5: Solve for x
   x = 2,534,122.82/1,686.72
6. Step 6: Final answer
   x = 1,502.40