Finding the Fourth Proportional to 105,991.86, 146,232.57 and 65,690.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105,991.86 : 146,232.57 = 65,690.91 : x
2. Step 2: Convert to fraction form
   105,991.86/146,232.57 = 65,690.91/x
3. Step 3: Cross multiply
   105,991.86x = 146,232.57 × 65,690.91
4. Step 4: Simplify right side
   105,991.86x = 9,606,150,594.94
5. Step 5: Solve for x
   x = 9,606,150,594.94/105,991.86
6. Step 6: Final answer
   x = 90,631.02