Finding the Fourth Proportional to 4,724.37, 7,086.15 and 1,438.20

Step by Step Solution

1. Step 1: Write the proportion equation
   4,724.37 : 7,086.15 = 1,438.20 : x
2. Step 2: Convert to fraction form
   4,724.37/7,086.15 = 1,438.20/x
3. Step 3: Cross multiply
   4,724.37x = 7,086.15 × 1,438.20
4. Step 4: Simplify right side
   4,724.37x = 10,191,300.93
5. Step 5: Solve for x
   x = 10,191,300.93/4,724.37
6. Step 6: Final answer
   x = 2,157.18