Finding the Fourth Proportional to 105,411.86, 145,418.11 and 65,111.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.86 : 145,418.11 = 65,111.12 : x
2. Step 2: Convert to fraction form
   105,411.86/145,418.11 = 65,111.12/x
3. Step 3: Cross multiply
   105,411.86x = 145,418.11 × 65,111.12
4. Step 4: Simplify right side
   105,411.86x = 9,468,336,010.38
5. Step 5: Solve for x
   x = 9,468,336,010.38/105,411.86
6. Step 6: Final answer
   x = 89,822.30