Finding the Fourth Proportional to 2,947.88, 4,419.18 and 1,215.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,947.88 : 4,419.18 = 1,215.40 : x
2. Step 2: Convert to fraction form
   2,947.88/4,419.18 = 1,215.40/x
3. Step 3: Cross multiply
   2,947.88x = 4,419.18 × 1,215.40
4. Step 4: Simplify right side
   2,947.88x = 5,371,071.37
5. Step 5: Solve for x
   x = 5,371,071.37/2,947.88
6. Step 6: Final answer
   x = 1,822.01