Finding the Fourth Proportional to 3,784.50, 5,680.87 and 2,870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.50 : 5,680.87 = 2,870.05 : x
2. Step 2: Convert to fraction form
   3,784.50/5,680.87 = 2,870.05/x
3. Step 3: Cross multiply
   3,784.50x = 5,680.87 × 2,870.05
4. Step 4: Simplify right side
   3,784.50x = 16,304,366.59
5. Step 5: Solve for x
   x = 16,304,366.59/3,784.50
6. Step 6: Final answer
   x = 4,308.20