Finding the Fourth Proportional to 2,679.20, 4,017.90 and 947.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.20 : 4,017.90 = 947.42 : x
2. Step 2: Convert to fraction form
   2,679.20/4,017.90 = 947.42/x
3. Step 3: Cross multiply
   2,679.20x = 4,017.90 × 947.42
4. Step 4: Simplify right side
   2,679.20x = 3,806,638.82
5. Step 5: Solve for x
   x = 3,806,638.82/2,679.20
6. Step 6: Final answer
   x = 1,420.81