Finding the Fourth Proportional to 826.86, 1,140.81 and 661.01

Step by Step Solution

1. Step 1: Write the proportion equation
   826.86 : 1,140.81 = 661.01 : x
2. Step 2: Convert to fraction form
   826.86/1,140.81 = 661.01/x
3. Step 3: Cross multiply
   826.86x = 1,140.81 × 661.01
4. Step 4: Simplify right side
   826.86x = 754,086.91
5. Step 5: Solve for x
   x = 754,086.91/826.86
6. Step 6: Final answer
   x = 911.99