Finding the Fourth Proportional to 2,897.86, 3,998 and 2,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,897.86 : 3,998 = 2,618.50 : x
2. Step 2: Convert to fraction form
   2,897.86/3,998 = 2,618.50/x
3. Step 3: Cross multiply
   2,897.86x = 3,998 × 2,618.50
4. Step 4: Simplify right side
   2,897.86x = 10,468,763
5. Step 5: Solve for x
   x = 10,468,763/2,897.86
6. Step 6: Final answer
   x = 3,612.58