Finding the Fourth Proportional to 2,820.88, 3,889.20 and 2,190.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.88 : 3,889.20 = 2,190.34 : x
2. Step 2: Convert to fraction form
   2,820.88/3,889.20 = 2,190.34/x
3. Step 3: Cross multiply
   2,820.88x = 3,889.20 × 2,190.34
4. Step 4: Simplify right side
   2,820.88x = 8,518,670.33
5. Step 5: Solve for x
   x = 8,518,670.33/2,820.88
6. Step 6: Final answer
   x = 3,019.86