Finding the Fourth Proportional to 3,457.18, 4,769.55 and 2,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   3,457.18 : 4,769.55 = 2,128.58 : x
2. Step 2: Convert to fraction form
   3,457.18/4,769.55 = 2,128.58/x
3. Step 3: Cross multiply
   3,457.18x = 4,769.55 × 2,128.58
4. Step 4: Simplify right side
   3,457.18x = 10,152,362.78
5. Step 5: Solve for x
   x = 10,152,362.78/3,457.18
6. Step 6: Final answer
   x = 2,936.60