Finding the Fourth Proportional to 1,355.59, 1,870.77 and 766.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.59 : 1,870.77 = 766.09 : x
2. Step 2: Convert to fraction form
   1,355.59/1,870.77 = 766.09/x
3. Step 3: Cross multiply
   1,355.59x = 1,870.77 × 766.09
4. Step 4: Simplify right side
   1,355.59x = 1,433,178.19
5. Step 5: Solve for x
   x = 1,433,178.19/1,355.59
6. Step 6: Final answer
   x = 1,057.24