Finding the Fourth Proportional to 1,355.55, 1,870.63 and 766.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.55 : 1,870.63 = 766.05 : x
2. Step 2: Convert to fraction form
   1,355.55/1,870.63 = 766.05/x
3. Step 3: Cross multiply
   1,355.55x = 1,870.63 × 766.05
4. Step 4: Simplify right side
   1,355.55x = 1,432,996.11
5. Step 5: Solve for x
   x = 1,432,996.11/1,355.55
6. Step 6: Final answer
   x = 1,057.13