Finding the Fourth Proportional to 3,870.60, 5,340.12 and 2,191.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.60 : 5,340.12 = 2,191.82 : x
2. Step 2: Convert to fraction form
   3,870.60/5,340.12 = 2,191.82/x
3. Step 3: Cross multiply
   3,870.60x = 5,340.12 × 2,191.82
4. Step 4: Simplify right side
   3,870.60x = 11,704,581.82
5. Step 5: Solve for x
   x = 11,704,581.82/3,870.60
6. Step 6: Final answer
   x = 3,023.97