Finding the Fourth Proportional to 42,969.50, 64,479.34 and 18,007.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,969.50 : 64,479.34 = 18,007.48 : x
2. Step 2: Convert to fraction form
   42,969.50/64,479.34 = 18,007.48/x
3. Step 3: Cross multiply
   42,969.50x = 64,479.34 × 18,007.48
4. Step 4: Simplify right side
   42,969.50x = 1,161,110,528.57
5. Step 5: Solve for x
   x = 1,161,110,528.57/42,969.50
6. Step 6: Final answer
   x = 27,021.73