Finding the Fourth Proportional to 105,059.60, 157,704.60 and 65,661.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,059.60 : 157,704.60 = 65,661.20 : x
2. Step 2: Convert to fraction form
   105,059.60/157,704.60 = 65,661.20/x
3. Step 3: Cross multiply
   105,059.60x = 157,704.60 × 65,661.20
4. Step 4: Simplify right side
   105,059.60x = 10,355,073,281.52
5. Step 5: Solve for x
   x = 10,355,073,281.52/105,059.60
6. Step 6: Final answer
   x = 98,563.80