Finding the Fourth Proportional to 42,663.20, 64,019.10 and 16,386.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,663.20 : 64,019.10 = 16,386.80 : x
2. Step 2: Convert to fraction form
   42,663.20/64,019.10 = 16,386.80/x
3. Step 3: Cross multiply
   42,663.20x = 64,019.10 × 16,386.80
4. Step 4: Simplify right side
   42,663.20x = 1,049,068,187.88
5. Step 5: Solve for x
   x = 1,049,068,187.88/42,663.20
6. Step 6: Final answer
   x = 24,589.53