Finding the Fourth Proportional to 3,942, 5,438.72 and 2,430.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942 : 5,438.72 = 2,430.12 : x
2. Step 2: Convert to fraction form
   3,942/5,438.72 = 2,430.12/x
3. Step 3: Cross multiply
   3,942x = 5,438.72 × 2,430.12
4. Step 4: Simplify right side
   3,942x = 13,216,742.25
5. Step 5: Solve for x
   x = 13,216,742.25/3,942
6. Step 6: Final answer
   x = 3,352.80