Finding the Fourth Proportional to 42,756.54, 64,135.89 and 20,261.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,756.54 : 64,135.89 = 20,261.94 : x
2. Step 2: Convert to fraction form
   42,756.54/64,135.89 = 20,261.94/x
3. Step 3: Cross multiply
   42,756.54x = 64,135.89 × 20,261.94
4. Step 4: Simplify right side
   42,756.54x = 1,299,517,555.03
5. Step 5: Solve for x
   x = 1,299,517,555.03/42,756.54
6. Step 6: Final answer
   x = 30,393.42