Finding the Fourth Proportional to 105,575.67, 145,639.22 and 65,276.55

Step by Step Solution

1. Step 1: Write the proportion equation
   105,575.67 : 145,639.22 = 65,276.55 : x
2. Step 2: Convert to fraction form
   105,575.67/145,639.22 = 65,276.55/x
3. Step 3: Cross multiply
   105,575.67x = 145,639.22 × 65,276.55
4. Step 4: Simplify right side
   105,575.67x = 9,506,825,499.91
5. Step 5: Solve for x
   x = 9,506,825,499.91/105,575.67
6. Step 6: Final answer
   x = 90,047.50