Finding the Fourth Proportional to 2,478.56, 3,420.40 and 1,401.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.56 : 3,420.40 = 1,401.88 : x
2. Step 2: Convert to fraction form
   2,478.56/3,420.40 = 1,401.88/x
3. Step 3: Cross multiply
   2,478.56x = 3,420.40 × 1,401.88
4. Step 4: Simplify right side
   2,478.56x = 4,794,990.35
5. Step 5: Solve for x
   x = 4,794,990.35/2,478.56
6. Step 6: Final answer
   x = 1,934.59