Finding the Fourth Proportional to 42,878.69, 64,340.00 and 20,414.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,878.69 : 64,340.00 = 20,414.79 : x
2. Step 2: Convert to fraction form
   42,878.69/64,340.00 = 20,414.79/x
3. Step 3: Cross multiply
   42,878.69x = 64,340.00 × 20,414.79
4. Step 4: Simplify right side
   42,878.69x = 1,313,487,486.53
5. Step 5: Solve for x
   x = 1,313,487,486.53/42,878.69
6. Step 6: Final answer
   x = 30,632.64