Finding the Fourth Proportional to 105,386.79, 158,048.28 and 55,439.34

Step by Step Solution

1. Step 1: Write the proportion equation
   105,386.79 : 158,048.28 = 55,439.34 : x
2. Step 2: Convert to fraction form
   105,386.79/158,048.28 = 55,439.34/x
3. Step 3: Cross multiply
   105,386.79x = 158,048.28 × 55,439.34
4. Step 4: Simplify right side
   105,386.79x = 8,762,092,331.34
5. Step 5: Solve for x
   x = 8,762,092,331.34/105,386.79
6. Step 6: Final answer
   x = 83,142.23