Finding the Fourth Proportional to 1,054.16, 1,454.58 and 661.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.16 : 1,454.58 = 661.31 : x
2. Step 2: Convert to fraction form
   1,054.16/1,454.58 = 661.31/x
3. Step 3: Cross multiply
   1,054.16x = 1,454.58 × 661.31
4. Step 4: Simplify right side
   1,054.16x = 961,921.03
5. Step 5: Solve for x
   x = 961,921.03/1,054.16
6. Step 6: Final answer
   x = 912.50