Finding the Fourth Proportional to 105,089.20, 157,779.60 and 65,723.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,089.20 : 157,779.60 = 65,723.20 : x
2. Step 2: Convert to fraction form
   105,089.20/157,779.60 = 65,723.20/x
3. Step 3: Cross multiply
   105,089.20x = 157,779.60 × 65,723.20
4. Step 4: Simplify right side
   105,089.20x = 10,369,780,206.72
5. Step 5: Solve for x
   x = 10,369,780,206.72/105,089.20
6. Step 6: Final answer
   x = 98,675.98