Finding the Fourth Proportional to 3,870.09, 5,340.96 and 2,191.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.09 : 5,340.96 = 2,191.67 : x
2. Step 2: Convert to fraction form
   3,870.09/5,340.96 = 2,191.67/x
3. Step 3: Cross multiply
   3,870.09x = 5,340.96 × 2,191.67
4. Step 4: Simplify right side
   3,870.09x = 11,705,595.10
5. Step 5: Solve for x
   x = 11,705,595.10/3,870.09
6. Step 6: Final answer
   x = 3,024.63