Finding the Fourth Proportional to 42,781.50, 64,198.17 and 18,157.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,781.50 : 64,198.17 = 18,157.50 : x
2. Step 2: Convert to fraction form
   42,781.50/64,198.17 = 18,157.50/x
3. Step 3: Cross multiply
   42,781.50x = 64,198.17 × 18,157.50
4. Step 4: Simplify right side
   42,781.50x = 1,165,678,271.78
5. Step 5: Solve for x
   x = 1,165,678,271.78/42,781.50
6. Step 6: Final answer
   x = 27,247.25