Finding the Fourth Proportional to 1,789.85, 2,681.86 and 911.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.85 : 2,681.86 = 911.15 : x
2. Step 2: Convert to fraction form
   1,789.85/2,681.86 = 911.15/x
3. Step 3: Cross multiply
   1,789.85x = 2,681.86 × 911.15
4. Step 4: Simplify right side
   1,789.85x = 2,443,561.05
5. Step 5: Solve for x
   x = 2,443,561.05/1,789.85
6. Step 6: Final answer
   x = 1,365.23