Finding the Fourth Proportional to 42,870.04, 64,314.24 and 13,287.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.04 : 64,314.24 = 13,287.22 : x
2. Step 2: Convert to fraction form
   42,870.04/64,314.24 = 13,287.22/x
3. Step 3: Cross multiply
   42,870.04x = 64,314.24 × 13,287.22
4. Step 4: Simplify right side
   42,870.04x = 854,557,456.01
5. Step 5: Solve for x
   x = 854,557,456.01/42,870.04
6. Step 6: Final answer
   x = 19,933.68