Finding the Fourth Proportional to 1,127.34, 1,555.56 and 661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.34 : 1,555.56 = 661.50 : x
2. Step 2: Convert to fraction form
   1,127.34/1,555.56 = 661.50/x
3. Step 3: Cross multiply
   1,127.34x = 1,555.56 × 661.50
4. Step 4: Simplify right side
   1,127.34x = 1,029,002.94
5. Step 5: Solve for x
   x = 1,029,002.94/1,127.34
6. Step 6: Final answer
   x = 912.77