Finding the Fourth Proportional to 1,355.49, 1,870.68 and 766.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.49 : 1,870.68 = 766.12 : x
2. Step 2: Convert to fraction form
   1,355.49/1,870.68 = 766.12/x
3. Step 3: Cross multiply
   1,355.49x = 1,870.68 × 766.12
4. Step 4: Simplify right side
   1,355.49x = 1,433,165.36
5. Step 5: Solve for x
   x = 1,433,165.36/1,355.49
6. Step 6: Final answer
   x = 1,057.30