Finding the Fourth Proportional to 3,870.18, 5,340.96 and 2,191.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.18 : 5,340.96 = 2,191.55 : x
2. Step 2: Convert to fraction form
   3,870.18/5,340.96 = 2,191.55/x
3. Step 3: Cross multiply
   3,870.18x = 5,340.96 × 2,191.55
4. Step 4: Simplify right side
   3,870.18x = 11,704,980.89
5. Step 5: Solve for x
   x = 11,704,980.89/3,870.18
6. Step 6: Final answer
   x = 3,024.40