Finding the Fourth Proportional to 105,378.86, 145,382.10 and 65,022.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,378.86 : 145,382.10 = 65,022.50 : x
2. Step 2: Convert to fraction form
   105,378.86/145,382.10 = 65,022.50/x
3. Step 3: Cross multiply
   105,378.86x = 145,382.10 × 65,022.50
4. Step 4: Simplify right side
   105,378.86x = 9,453,107,597.25
5. Step 5: Solve for x
   x = 9,453,107,597.25/105,378.86
6. Step 6: Final answer
   x = 89,705.92