Finding the Fourth Proportional to 42,749.45, 64,131.20 and 13,167.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,749.45 : 64,131.20 = 13,167.29 : x
2. Step 2: Convert to fraction form
   42,749.45/64,131.20 = 13,167.29/x
3. Step 3: Cross multiply
   42,749.45x = 64,131.20 × 13,167.29
4. Step 4: Simplify right side
   42,749.45x = 844,434,042.61
5. Step 5: Solve for x
   x = 844,434,042.61/42,749.45
6. Step 6: Final answer
   x = 19,753.10