Finding the Fourth Proportional to 42,985.94, 64,458.17 and 18,019.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,985.94 : 64,458.17 = 18,019.29 : x
2. Step 2: Convert to fraction form
   42,985.94/64,458.17 = 18,019.29/x
3. Step 3: Cross multiply
   42,985.94x = 64,458.17 × 18,019.29
4. Step 4: Simplify right side
   42,985.94x = 1,161,490,458.10
5. Step 5: Solve for x
   x = 1,161,490,458.10/42,985.94
6. Step 6: Final answer
   x = 27,020.24