Finding the Fourth Proportional to 42,660.12, 64,002.47 and 13,082.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,660.12 : 64,002.47 = 13,082.30 : x
2. Step 2: Convert to fraction form
   42,660.12/64,002.47 = 13,082.30/x
3. Step 3: Cross multiply
   42,660.12x = 64,002.47 × 13,082.30
4. Step 4: Simplify right side
   42,660.12x = 837,299,127.86
5. Step 5: Solve for x
   x = 837,299,127.86/42,660.12
6. Step 6: Final answer
   x = 19,627.21