Finding the Fourth Proportional to 42,749.20, 64,130.82 and 13,167.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,749.20 : 64,130.82 = 13,167.04 : x
2. Step 2: Convert to fraction form
   42,749.20/64,130.82 = 13,167.04/x
3. Step 3: Cross multiply
   42,749.20x = 64,130.82 × 13,167.04
4. Step 4: Simplify right side
   42,749.20x = 844,413,072.17
5. Step 5: Solve for x
   x = 844,413,072.17/42,749.20
6. Step 6: Final answer
   x = 19,752.72