Finding the Fourth Proportional to 2,003.31, 2,763.86 and 1,217.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.31 : 2,763.86 = 1,217.07 : x
2. Step 2: Convert to fraction form
   2,003.31/2,763.86 = 1,217.07/x
3. Step 3: Cross multiply
   2,003.31x = 2,763.86 × 1,217.07
4. Step 4: Simplify right side
   2,003.31x = 3,363,805.00
5. Step 5: Solve for x
   x = 3,363,805.00/2,003.31
6. Step 6: Final answer
   x = 1,679.12