Finding the Fourth Proportional to 105,677.96, 145,850.59 and 65,404.69

Step by Step Solution

1. Step 1: Write the proportion equation
   105,677.96 : 145,850.59 = 65,404.69 : x
2. Step 2: Convert to fraction form
   105,677.96/145,850.59 = 65,404.69/x
3. Step 3: Cross multiply
   105,677.96x = 145,850.59 × 65,404.69
4. Step 4: Simplify right side
   105,677.96x = 9,539,312,342.40
5. Step 5: Solve for x
   x = 9,539,312,342.40/105,677.96
6. Step 6: Final answer
   x = 90,267.76