Finding the Fourth Proportional to 2,958.30, 4,429.85 and 2,870.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,958.30 : 4,429.85 = 2,870.70 : x
2. Step 2: Convert to fraction form
   2,958.30/4,429.85 = 2,870.70/x
3. Step 3: Cross multiply
   2,958.30x = 4,429.85 × 2,870.70
4. Step 4: Simplify right side
   2,958.30x = 12,716,770.40
5. Step 5: Solve for x
   x = 12,716,770.40/2,958.30
6. Step 6: Final answer
   x = 4,298.68