Finding the Fourth Proportional to 105,499.23, 145,538.58 and 65,198.49

Step by Step Solution

1. Step 1: Write the proportion equation
   105,499.23 : 145,538.58 = 65,198.49 : x
2. Step 2: Convert to fraction form
   105,499.23/145,538.58 = 65,198.49/x
3. Step 3: Cross multiply
   105,499.23x = 145,538.58 × 65,198.49
4. Step 4: Simplify right side
   105,499.23x = 9,488,895,652.74
5. Step 5: Solve for x
   x = 9,488,895,652.74/105,499.23
6. Step 6: Final answer
   x = 89,942.80