Finding the Fourth Proportional to 1,690.43, 2,540.12 and 911.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,690.43 : 2,540.12 = 911.03 : x
2. Step 2: Convert to fraction form
   1,690.43/2,540.12 = 911.03/x
3. Step 3: Cross multiply
   1,690.43x = 2,540.12 × 911.03
4. Step 4: Simplify right side
   1,690.43x = 2,314,108.27
5. Step 5: Solve for x
   x = 2,314,108.27/1,690.43
6. Step 6: Final answer
   x = 1,368.95