Finding the Fourth Proportional to 42,016.84, 63,018.78 and 18,639.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,016.84 : 63,018.78 = 18,639.16 : x
2. Step 2: Convert to fraction form
   42,016.84/63,018.78 = 18,639.16/x
3. Step 3: Cross multiply
   42,016.84x = 63,018.78 × 18,639.16
4. Step 4: Simplify right side
   42,016.84x = 1,174,617,123.42
5. Step 5: Solve for x
   x = 1,174,617,123.42/42,016.84
6. Step 6: Final answer
   x = 27,955.87