Finding the Fourth Proportional to 2,099.78, 2,897.51 and 1,215.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.78 : 2,897.51 = 1,215.63 : x
2. Step 2: Convert to fraction form
   2,099.78/2,897.51 = 1,215.63/x
3. Step 3: Cross multiply
   2,099.78x = 2,897.51 × 1,215.63
4. Step 4: Simplify right side
   2,099.78x = 3,522,294.00
5. Step 5: Solve for x
   x = 3,522,294.00/2,099.78
6. Step 6: Final answer
   x = 1,677.46