Finding the Fourth Proportional to 1,127.31, 1,556.00 and 661.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.31 : 1,556.00 = 661.71 : x
2. Step 2: Convert to fraction form
   1,127.31/1,556.00 = 661.71/x
3. Step 3: Cross multiply
   1,127.31x = 1,556.00 × 661.71
4. Step 4: Simplify right side
   1,127.31x = 1,029,617.45
5. Step 5: Solve for x
   x = 1,029,617.45/1,127.31
6. Step 6: Final answer
   x = 913.34