Finding the Fourth Proportional to 1,081.03, 1,491.17 and 661.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.03 : 1,491.17 = 661.56 : x
2. Step 2: Convert to fraction form
   1,081.03/1,491.17 = 661.56/x
3. Step 3: Cross multiply
   1,081.03x = 1,491.17 × 661.56
4. Step 4: Simplify right side
   1,081.03x = 986,498.43
5. Step 5: Solve for x
   x = 986,498.43/1,081.03
6. Step 6: Final answer
   x = 912.55