Finding the Fourth Proportional to 2,478.70, 3,718.50 and 1,246.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.70 : 3,718.50 = 1,246.72 : x
2. Step 2: Convert to fraction form
   2,478.70/3,718.50 = 1,246.72/x
3. Step 3: Cross multiply
   2,478.70x = 3,718.50 × 1,246.72
4. Step 4: Simplify right side
   2,478.70x = 4,635,928.32
5. Step 5: Solve for x
   x = 4,635,928.32/2,478.70
6. Step 6: Final answer
   x = 1,870.31