Finding the Fourth Proportional to 42,742.34, 64,119.57 and 13,162.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,742.34 : 64,119.57 = 13,162.58 : x
2. Step 2: Convert to fraction form
   42,742.34/64,119.57 = 13,162.58/x
3. Step 3: Cross multiply
   42,742.34x = 64,119.57 × 13,162.58
4. Step 4: Simplify right side
   42,742.34x = 843,978,969.69
5. Step 5: Solve for x
   x = 843,978,969.69/42,742.34
6. Step 6: Final answer
   x = 19,745.74