Finding the Fourth Proportional to 2,957.79, 4,429.10 and 2,870.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,957.79 : 4,429.10 = 2,870.20 : x
2. Step 2: Convert to fraction form
   2,957.79/4,429.10 = 2,870.20/x
3. Step 3: Cross multiply
   2,957.79x = 4,429.10 × 2,870.20
4. Step 4: Simplify right side
   2,957.79x = 12,712,415.53
5. Step 5: Solve for x
   x = 12,712,415.53/2,957.79
6. Step 6: Final answer
   x = 4,297.94