Finding the Fourth Proportional to 3,870.34, 5,340.88 and 2,191.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.34 : 5,340.88 = 2,191.70 : x
2. Step 2: Convert to fraction form
   3,870.34/5,340.88 = 2,191.70/x
3. Step 3: Cross multiply
   3,870.34x = 5,340.88 × 2,191.70
4. Step 4: Simplify right side
   3,870.34x = 11,705,632.88
5. Step 5: Solve for x
   x = 11,705,632.88/3,870.34
6. Step 6: Final answer
   x = 3,024.45