Finding the Fourth Proportional to 1,358.38, 1,874.46 and 768.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.38 : 1,874.46 = 768.80 : x
2. Step 2: Convert to fraction form
   1,358.38/1,874.46 = 768.80/x
3. Step 3: Cross multiply
   1,358.38x = 1,874.46 × 768.80
4. Step 4: Simplify right side
   1,358.38x = 1,441,077.55
5. Step 5: Solve for x
   x = 1,441,077.55/1,358.38
6. Step 6: Final answer
   x = 1,060.88