Finding the Fourth Proportional to 1,054.62, 1,454.76 and 661.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.62 : 1,454.76 = 661.57 : x
2. Step 2: Convert to fraction form
   1,054.62/1,454.76 = 661.57/x
3. Step 3: Cross multiply
   1,054.62x = 1,454.76 × 661.57
4. Step 4: Simplify right side
   1,054.62x = 962,425.57
5. Step 5: Solve for x
   x = 962,425.57/1,054.62
6. Step 6: Final answer
   x = 912.58