Finding the Fourth Proportional to 3,902.22, 5,378.72 and 2,406.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.22 : 5,378.72 = 2,406.90 : x
2. Step 2: Convert to fraction form
   3,902.22/5,378.72 = 2,406.90/x
3. Step 3: Cross multiply
   3,902.22x = 5,378.72 × 2,406.90
4. Step 4: Simplify right side
   3,902.22x = 12,946,041.17
5. Step 5: Solve for x
   x = 12,946,041.17/3,902.22
6. Step 6: Final answer
   x = 3,317.61