Finding the Fourth Proportional to 1,055.40, 1,455.72 and 662.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.40 : 1,455.72 = 662.16 : x
2. Step 2: Convert to fraction form
   1,055.40/1,455.72 = 662.16/x
3. Step 3: Cross multiply
   1,055.40x = 1,455.72 × 662.16
4. Step 4: Simplify right side
   1,055.40x = 963,919.56
5. Step 5: Solve for x
   x = 963,919.56/1,055.40
6. Step 6: Final answer
   x = 913.32