Finding the Fourth Proportional to 2,099.97, 2,897.37 and 1,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.97 : 2,897.37 = 1,215.72 : x
2. Step 2: Convert to fraction form
   2,099.97/2,897.37 = 1,215.72/x
3. Step 3: Cross multiply
   2,099.97x = 2,897.37 × 1,215.72
4. Step 4: Simplify right side
   2,099.97x = 3,522,390.66
5. Step 5: Solve for x
   x = 3,522,390.66/2,099.97
6. Step 6: Final answer
   x = 1,677.35