Finding the Fourth Proportional to 1,200.57, 1,654.32 and 920.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.57 : 1,654.32 = 920.79 : x
2. Step 2: Convert to fraction form
   1,200.57/1,654.32 = 920.79/x
3. Step 3: Cross multiply
   1,200.57x = 1,654.32 × 920.79
4. Step 4: Simplify right side
   1,200.57x = 1,523,281.31
5. Step 5: Solve for x
   x = 1,523,281.31/1,200.57
6. Step 6: Final answer
   x = 1,268.80