Finding the Fourth Proportional to 1,357.98, 1,874.01 and 768.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.98 : 1,874.01 = 768.55 : x
2. Step 2: Convert to fraction form
   1,357.98/1,874.01 = 768.55/x
3. Step 3: Cross multiply
   1,357.98x = 1,874.01 × 768.55
4. Step 4: Simplify right side
   1,357.98x = 1,440,270.39
5. Step 5: Solve for x
   x = 1,440,270.39/1,357.98
6. Step 6: Final answer
   x = 1,060.60