Finding the Fourth Proportional to 2,099.80, 2,897.94 and 1,215.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.80 : 2,897.94 = 1,215.56 : x
2. Step 2: Convert to fraction form
   2,099.80/2,897.94 = 1,215.56/x
3. Step 3: Cross multiply
   2,099.80x = 2,897.94 × 1,215.56
4. Step 4: Simplify right side
   2,099.80x = 3,522,619.95
5. Step 5: Solve for x
   x = 3,522,619.95/2,099.80
6. Step 6: Final answer
   x = 1,677.60