Finding the Fourth Proportional to 42,983.55, 64,487.79 and 13,401.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,983.55 : 64,487.79 = 13,401.72 : x
2. Step 2: Convert to fraction form
   42,983.55/64,487.79 = 13,401.72/x
3. Step 3: Cross multiply
   42,983.55x = 64,487.79 × 13,401.72
4. Step 4: Simplify right side
   42,983.55x = 864,247,305.00
5. Step 5: Solve for x
   x = 864,247,305.00/42,983.55
6. Step 6: Final answer
   x = 20,106.47