Finding the Fourth Proportional to 42,761.54, 64,081.56 and 20,248.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,761.54 : 64,081.56 = 20,248.20 : x
2. Step 2: Convert to fraction form
   42,761.54/64,081.56 = 20,248.20/x
3. Step 3: Cross multiply
   42,761.54x = 64,081.56 × 20,248.20
4. Step 4: Simplify right side
   42,761.54x = 1,297,536,243.19
5. Step 5: Solve for x
   x = 1,297,536,243.19/42,761.54
6. Step 6: Final answer
   x = 30,343.53