Finding the Fourth Proportional to 1,355.43, 1,870.60 and 766.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.43 : 1,870.60 = 766.07 : x
2. Step 2: Convert to fraction form
   1,355.43/1,870.60 = 766.07/x
3. Step 3: Cross multiply
   1,355.43x = 1,870.60 × 766.07
4. Step 4: Simplify right side
   1,355.43x = 1,433,010.54
5. Step 5: Solve for x
   x = 1,433,010.54/1,355.43
6. Step 6: Final answer
   x = 1,057.24