Finding the Fourth Proportional to 42,878.12, 64,282.83 and 20,377.51

Step by Step Solution

1. Step 1: Write the proportion equation
   42,878.12 : 64,282.83 = 20,377.51 : x
2. Step 2: Convert to fraction form
   42,878.12/64,282.83 = 20,377.51/x
3. Step 3: Cross multiply
   42,878.12x = 64,282.83 × 20,377.51
4. Step 4: Simplify right side
   42,878.12x = 1,309,923,850.45
5. Step 5: Solve for x
   x = 1,309,923,850.45/42,878.12
6. Step 6: Final answer
   x = 30,549.93