Finding the Fourth Proportional to 1,359.59, 1,875.17 and 911.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.59 : 1,875.17 = 911.31 : x
2. Step 2: Convert to fraction form
   1,359.59/1,875.17 = 911.31/x
3. Step 3: Cross multiply
   1,359.59x = 1,875.17 × 911.31
4. Step 4: Simplify right side
   1,359.59x = 1,708,853.09
5. Step 5: Solve for x
   x = 1,708,853.09/1,359.59
6. Step 6: Final answer
   x = 1,256.89