Finding the Fourth Proportional to 2,587.44, 3,870.96 and 1,997.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.44 : 3,870.96 = 1,997.86 : x
2. Step 2: Convert to fraction form
   2,587.44/3,870.96 = 1,997.86/x
3. Step 3: Cross multiply
   2,587.44x = 3,870.96 × 1,997.86
4. Step 4: Simplify right side
   2,587.44x = 7,733,636.15
5. Step 5: Solve for x
   x = 7,733,636.15/2,587.44
6. Step 6: Final answer
   x = 2,988.91