Finding the Fourth Proportional to 1,417.55, 1,955.57 and 920.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.55 : 1,955.57 = 920.21 : x
2. Step 2: Convert to fraction form
   1,417.55/1,955.57 = 920.21/x
3. Step 3: Cross multiply
   1,417.55x = 1,955.57 × 920.21
4. Step 4: Simplify right side
   1,417.55x = 1,799,520.69
5. Step 5: Solve for x
   x = 1,799,520.69/1,417.55
6. Step 6: Final answer
   x = 1,269.46