Finding the Fourth Proportional to 42,911.50, 64,367.34 and 18,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,911.50 : 64,367.34 = 18,287.50 : x
2. Step 2: Convert to fraction form
   42,911.50/64,367.34 = 18,287.50/x
3. Step 3: Cross multiply
   42,911.50x = 64,367.34 × 18,287.50
4. Step 4: Simplify right side
   42,911.50x = 1,177,117,730.25
5. Step 5: Solve for x
   x = 1,177,117,730.25/42,911.50
6. Step 6: Final answer
   x = 27,431.29