Finding the Fourth Proportional to 1,357.86, 1,874.03 and 768.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.86 : 1,874.03 = 768.40 : x
2. Step 2: Convert to fraction form
   1,357.86/1,874.03 = 768.40/x
3. Step 3: Cross multiply
   1,357.86x = 1,874.03 × 768.40
4. Step 4: Simplify right side
   1,357.86x = 1,439,996.12
5. Step 5: Solve for x
   x = 1,439,996.12/1,357.86
6. Step 6: Final answer
   x = 1,060.49