Finding the Fourth Proportional to 105,410.86, 145,416.73 and 65,110.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,410.86 : 145,416.73 = 65,110.12 : x
2. Step 2: Convert to fraction form
   105,410.86/145,416.73 = 65,110.12/x
3. Step 3: Cross multiply
   105,410.86x = 145,416.73 × 65,110.12
4. Step 4: Simplify right side
   105,410.86x = 9,468,100,740.31
5. Step 5: Solve for x
   x = 9,468,100,740.31/105,410.86
6. Step 6: Final answer
   x = 89,820.92