Finding the Fourth Proportional to 42,985.69, 64,457.80 and 18,019.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,985.69 : 64,457.80 = 18,019.04 : x
2. Step 2: Convert to fraction form
   42,985.69/64,457.80 = 18,019.04/x
3. Step 3: Cross multiply
   42,985.69x = 64,457.80 × 18,019.04
4. Step 4: Simplify right side
   42,985.69x = 1,161,467,309.18
5. Step 5: Solve for x
   x = 1,161,467,309.18/42,985.69
6. Step 6: Final answer
   x = 27,019.86