Finding the Fourth Proportional to 42,983.34, 64,490.13 and 13,408.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,983.34 : 64,490.13 = 13,408.62 : x
2. Step 2: Convert to fraction form
   42,983.34/64,490.13 = 13,408.62/x
3. Step 3: Cross multiply
   42,983.34x = 64,490.13 × 13,408.62
4. Step 4: Simplify right side
   42,983.34x = 864,723,646.92
5. Step 5: Solve for x
   x = 864,723,646.92/42,983.34
6. Step 6: Final answer
   x = 20,117.65