Finding the Fourth Proportional to 105,411.94, 158,120.21 and 42,261.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.94 : 158,120.21 = 42,261.80 : x
2. Step 2: Convert to fraction form
   105,411.94/158,120.21 = 42,261.80/x
3. Step 3: Cross multiply
   105,411.94x = 158,120.21 × 42,261.80
4. Step 4: Simplify right side
   105,411.94x = 6,682,443,689.07
5. Step 5: Solve for x
   x = 6,682,443,689.07/105,411.94
6. Step 6: Final answer
   x = 63,393.62