Finding the Fourth Proportional to 1,357.68, 1,873.55 and 768.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.68 : 1,873.55 = 768.20 : x
2. Step 2: Convert to fraction form
   1,357.68/1,873.55 = 768.20/x
3. Step 3: Cross multiply
   1,357.68x = 1,873.55 × 768.20
4. Step 4: Simplify right side
   1,357.68x = 1,439,247.90
5. Step 5: Solve for x
   x = 1,439,247.90/1,357.68
6. Step 6: Final answer
   x = 1,060.08