Finding the Fourth Proportional to 1,054.25, 1,455.41 and 661.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.25 : 1,455.41 = 661.67 : x
2. Step 2: Convert to fraction form
   1,054.25/1,455.41 = 661.67/x
3. Step 3: Cross multiply
   1,054.25x = 1,455.41 × 661.67
4. Step 4: Simplify right side
   1,054.25x = 962,997.83
5. Step 5: Solve for x
   x = 962,997.83/1,054.25
6. Step 6: Final answer
   x = 913.44