Finding the Fourth Proportional to 1,357.56, 1,873.61 and 768.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.56 : 1,873.61 = 768.21 : x
2. Step 2: Convert to fraction form
   1,357.56/1,873.61 = 768.21/x
3. Step 3: Cross multiply
   1,357.56x = 1,873.61 × 768.21
4. Step 4: Simplify right side
   1,357.56x = 1,439,328.49
5. Step 5: Solve for x
   x = 1,439,328.49/1,357.56
6. Step 6: Final answer
   x = 1,060.23