Finding the Fourth Proportional to 2,890.18, 3,990.41 and 1,897.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,890.18 : 3,990.41 = 1,897.15 : x
2. Step 2: Convert to fraction form
   2,890.18/3,990.41 = 1,897.15/x
3. Step 3: Cross multiply
   2,890.18x = 3,990.41 × 1,897.15
4. Step 4: Simplify right side
   2,890.18x = 7,570,386.87
5. Step 5: Solve for x
   x = 7,570,386.87/2,890.18
6. Step 6: Final answer
   x = 2,619.35