Finding the Fourth Proportional to 42,758.69, 64,113.42 and 13,168.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,758.69 : 64,113.42 = 13,168.58 : x
2. Step 2: Convert to fraction form
   42,758.69/64,113.42 = 13,168.58/x
3. Step 3: Cross multiply
   42,758.69x = 64,113.42 × 13,168.58
4. Step 4: Simplify right side
   42,758.69x = 844,282,429.16
5. Step 5: Solve for x
   x = 844,282,429.16/42,758.69
6. Step 6: Final answer
   x = 19,745.29