Finding the Fourth Proportional to 3,870.18, 5,340.88 and 2,191.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.18 : 5,340.88 = 2,191.60 : x
2. Step 2: Convert to fraction form
   3,870.18/5,340.88 = 2,191.60/x
3. Step 3: Cross multiply
   3,870.18x = 5,340.88 × 2,191.60
4. Step 4: Simplify right side
   3,870.18x = 11,705,072.61
5. Step 5: Solve for x
   x = 11,705,072.61/3,870.18
6. Step 6: Final answer
   x = 3,024.43