Finding the Fourth Proportional to 1,690.96, 2,330.73 and 1,131.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,690.96 : 2,330.73 = 1,131.23 : x
2. Step 2: Convert to fraction form
   1,690.96/2,330.73 = 1,131.23/x
3. Step 3: Cross multiply
   1,690.96x = 2,330.73 × 1,131.23
4. Step 4: Simplify right side
   1,690.96x = 2,636,580.04
5. Step 5: Solve for x
   x = 2,636,580.04/1,690.96
6. Step 6: Final answer
   x = 1,559.23