Finding the Fourth Proportional to 38,422, 57,642.72 and 10,720

Step by Step Solution

1. Step 1: Write the proportion equation
   38,422 : 57,642.72 = 10,720 : x
2. Step 2: Convert to fraction form
   38,422/57,642.72 = 10,720/x
3. Step 3: Cross multiply
   38,422x = 57,642.72 × 10,720
4. Step 4: Simplify right side
   38,422x = 617,929,958.40
5. Step 5: Solve for x
   x = 617,929,958.40/38,422
6. Step 6: Final answer
   x = 16,082.71