Finding the Fourth Proportional to 105,862.39, 158,672.79 and 42,642.06

Step by Step Solution

1. Step 1: Write the proportion equation
   105,862.39 : 158,672.79 = 42,642.06 : x
2. Step 2: Convert to fraction form
   105,862.39/158,672.79 = 42,642.06/x
3. Step 3: Cross multiply
   105,862.39x = 158,672.79 × 42,642.06
4. Step 4: Simplify right side
   105,862.39x = 6,766,134,036.52
5. Step 5: Solve for x
   x = 6,766,134,036.52/105,862.39
6. Step 6: Final answer
   x = 63,914.43