Finding the Fourth Proportional to 42,740.58, 64,087.38 and 13,150.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,740.58 : 64,087.38 = 13,150.20 : x
2. Step 2: Convert to fraction form
   42,740.58/64,087.38 = 13,150.20/x
3. Step 3: Cross multiply
   42,740.58x = 64,087.38 × 13,150.20
4. Step 4: Simplify right side
   42,740.58x = 842,761,864.48
5. Step 5: Solve for x
   x = 842,761,864.48/42,740.58
6. Step 6: Final answer
   x = 19,718.07