Finding the Fourth Proportional to 2,574.81, 3,861.60 and 1,478.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,574.81 : 3,861.60 = 1,478.61 : x
2. Step 2: Convert to fraction form
   2,574.81/3,861.60 = 1,478.61/x
3. Step 3: Cross multiply
   2,574.81x = 3,861.60 × 1,478.61
4. Step 4: Simplify right side
   2,574.81x = 5,709,800.38
5. Step 5: Solve for x
   x = 5,709,800.38/2,574.81
6. Step 6: Final answer
   x = 2,217.56