Finding the Fourth Proportional to 2,215.43, 3,321.75 and 1,174.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.43 : 3,321.75 = 1,174.78 : x
2. Step 2: Convert to fraction form
   2,215.43/3,321.75 = 1,174.78/x
3. Step 3: Cross multiply
   2,215.43x = 3,321.75 × 1,174.78
4. Step 4: Simplify right side
   2,215.43x = 3,902,308.86
5. Step 5: Solve for x
   x = 3,902,308.86/2,215.43
6. Step 6: Final answer
   x = 1,761.42