Finding the Fourth Proportional to 1,126.72, 1,555.04 and 661.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,126.72 : 1,555.04 = 661.12 : x
2. Step 2: Convert to fraction form
   1,126.72/1,555.04 = 661.12/x
3. Step 3: Cross multiply
   1,126.72x = 1,555.04 × 661.12
4. Step 4: Simplify right side
   1,126.72x = 1,028,068.04
5. Step 5: Solve for x
   x = 1,028,068.04/1,126.72
6. Step 6: Final answer
   x = 912.44