Finding the Fourth Proportional to 105,213.36, 157,857.12 and 65,724.24

Step by Step Solution

1. Step 1: Write the proportion equation
   105,213.36 : 157,857.12 = 65,724.24 : x
2. Step 2: Convert to fraction form
   105,213.36/157,857.12 = 65,724.24/x
3. Step 3: Cross multiply
   105,213.36x = 157,857.12 × 65,724.24
4. Step 4: Simplify right side
   105,213.36x = 10,375,039,240.59
5. Step 5: Solve for x
   x = 10,375,039,240.59/105,213.36
6. Step 6: Final answer
   x = 98,609.52