Finding the Fourth Proportional to 2,001.34, 2,761.86 and 1,215.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,001.34 : 2,761.86 = 1,215.20 : x
2. Step 2: Convert to fraction form
   2,001.34/2,761.86 = 1,215.20/x
3. Step 3: Cross multiply
   2,001.34x = 2,761.86 × 1,215.20
4. Step 4: Simplify right side
   2,001.34x = 3,356,212.27
5. Step 5: Solve for x
   x = 3,356,212.27/2,001.34
6. Step 6: Final answer
   x = 1,676.98