Finding the Fourth Proportional to 105,863.10, 158,673.84 and 42,642.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,863.10 : 158,673.84 = 42,642.72 : x
2. Step 2: Convert to fraction form
   105,863.10/158,673.84 = 42,642.72/x
3. Step 3: Cross multiply
   105,863.10x = 158,673.84 × 42,642.72
4. Step 4: Simplify right side
   105,863.10x = 6,766,284,130.44
5. Step 5: Solve for x
   x = 6,766,284,130.44/105,863.10
6. Step 6: Final answer
   x = 63,915.42