Finding the Fourth Proportional to 1,055.35, 1,455.73 and 661.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.35 : 1,455.73 = 661.69 : x
2. Step 2: Convert to fraction form
   1,055.35/1,455.73 = 661.69/x
3. Step 3: Cross multiply
   1,055.35x = 1,455.73 × 661.69
4. Step 4: Simplify right side
   1,055.35x = 963,241.98
5. Step 5: Solve for x
   x = 963,241.98/1,055.35
6. Step 6: Final answer
   x = 912.72