Finding the Fourth Proportional to 42,981.08, 64,471.64 and 13,401.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,981.08 : 64,471.64 = 13,401.30 : x
2. Step 2: Convert to fraction form
   42,981.08/64,471.64 = 13,401.30/x
3. Step 3: Cross multiply
   42,981.08x = 64,471.64 × 13,401.30
4. Step 4: Simplify right side
   42,981.08x = 864,003,789.13
5. Step 5: Solve for x
   x = 864,003,789.13/42,981.08
6. Step 6: Final answer
   x = 20,101.96