Finding the Fourth Proportional to 42,980.16, 64,440 and 16,662.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,980.16 : 64,440 = 16,662.72 : x
2. Step 2: Convert to fraction form
   42,980.16/64,440 = 16,662.72/x
3. Step 3: Cross multiply
   42,980.16x = 64,440 × 16,662.72
4. Step 4: Simplify right side
   42,980.16x = 1,073,745,676.80
5. Step 5: Solve for x
   x = 1,073,745,676.80/42,980.16
6. Step 6: Final answer
   x = 24,982.36