Finding the Fourth Proportional to 2,145.35, 3,218.05 and 758.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.35 : 3,218.05 = 758.72 : x
2. Step 2: Convert to fraction form
   2,145.35/3,218.05 = 758.72/x
3. Step 3: Cross multiply
   2,145.35x = 3,218.05 × 758.72
4. Step 4: Simplify right side
   2,145.35x = 2,441,607.89
5. Step 5: Solve for x
   x = 2,441,607.89/2,145.35
6. Step 6: Final answer
   x = 1,138.09