Finding the Fourth Proportional to 1,355.86, 1,870.99 and 766.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.86 : 1,870.99 = 766.36 : x
2. Step 2: Convert to fraction form
   1,355.86/1,870.99 = 766.36/x
3. Step 3: Cross multiply
   1,355.86x = 1,870.99 × 766.36
4. Step 4: Simplify right side
   1,355.86x = 1,433,851.90
5. Step 5: Solve for x
   x = 1,433,851.90/1,355.86
6. Step 6: Final answer
   x = 1,057.52