Finding the Fourth Proportional to 42,215.81, 63,345.55 and 18,540

Step by Step Solution

1. Step 1: Write the proportion equation
   42,215.81 : 63,345.55 = 18,540 : x
2. Step 2: Convert to fraction form
   42,215.81/63,345.55 = 18,540/x
3. Step 3: Cross multiply
   42,215.81x = 63,345.55 × 18,540
4. Step 4: Simplify right side
   42,215.81x = 1,174,426,404.30
5. Step 5: Solve for x
   x = 1,174,426,404.30/42,215.81
6. Step 6: Final answer
   x = 27,819.59