Finding the Fourth Proportional to 1,358.21, 1,874.27 and 768.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.21 : 1,874.27 = 768.74 : x
2. Step 2: Convert to fraction form
   1,358.21/1,874.27 = 768.74/x
3. Step 3: Cross multiply
   1,358.21x = 1,874.27 × 768.74
4. Step 4: Simplify right side
   1,358.21x = 1,440,818.87
5. Step 5: Solve for x
   x = 1,440,818.87/1,358.21
6. Step 6: Final answer
   x = 1,060.82