Finding the Fourth Proportional to 1,355.52, 1,870.51 and 766.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.52 : 1,870.51 = 766.11 : x
2. Step 2: Convert to fraction form
   1,355.52/1,870.51 = 766.11/x
3. Step 3: Cross multiply
   1,355.52x = 1,870.51 × 766.11
4. Step 4: Simplify right side
   1,355.52x = 1,433,016.42
5. Step 5: Solve for x
   x = 1,433,016.42/1,355.52
6. Step 6: Final answer
   x = 1,057.17