Finding the Fourth Proportional to 105,891.60, 158,868.49 and 42,679.25

Step by Step Solution

1. Step 1: Write the proportion equation
   105,891.60 : 158,868.49 = 42,679.25 : x
2. Step 2: Convert to fraction form
   105,891.60/158,868.49 = 42,679.25/x
3. Step 3: Cross multiply
   105,891.60x = 158,868.49 × 42,679.25
4. Step 4: Simplify right side
   105,891.60x = 6,780,388,670.21
5. Step 5: Solve for x
   x = 6,780,388,670.21/105,891.60
6. Step 6: Final answer
   x = 64,031.41