Finding the Fourth Proportional to 42,665.12, 63,998.61 and 13,082.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,665.12 : 63,998.61 = 13,082.30 : x
2. Step 2: Convert to fraction form
   42,665.12/63,998.61 = 13,082.30/x
3. Step 3: Cross multiply
   42,665.12x = 63,998.61 × 13,082.30
4. Step 4: Simplify right side
   42,665.12x = 837,249,126.54
5. Step 5: Solve for x
   x = 837,249,126.54/42,665.12
6. Step 6: Final answer
   x = 19,623.74