Finding the Fourth Proportional to 1,479.40, 2,215.98 and 1,378.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,479.40 : 2,215.98 = 1,378.12 : x
2. Step 2: Convert to fraction form
   1,479.40/2,215.98 = 1,378.12/x
3. Step 3: Cross multiply
   1,479.40x = 2,215.98 × 1,378.12
4. Step 4: Simplify right side
   1,479.40x = 3,053,886.36
5. Step 5: Solve for x
   x = 3,053,886.36/1,479.40
6. Step 6: Final answer
   x = 2,064.27