Finding the Fourth Proportional to 105,021.60, 157,647.60 and 65,623.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,021.60 : 157,647.60 = 65,623.20 : x
2. Step 2: Convert to fraction form
   105,021.60/157,647.60 = 65,623.20/x
3. Step 3: Cross multiply
   105,021.60x = 157,647.60 × 65,623.20
4. Step 4: Simplify right side
   105,021.60x = 10,345,339,984.32
5. Step 5: Solve for x
   x = 10,345,339,984.32/105,021.60
6. Step 6: Final answer
   x = 98,506.78