Finding the Fourth Proportional to 105,582.42, 145,648.50 and 65,283.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,582.42 : 145,648.50 = 65,283.30 : x
2. Step 2: Convert to fraction form
   105,582.42/145,648.50 = 65,283.30/x
3. Step 3: Cross multiply
   105,582.42x = 145,648.50 × 65,283.30
4. Step 4: Simplify right side
   105,582.42x = 9,508,414,720.05
5. Step 5: Solve for x
   x = 9,508,414,720.05/105,582.42
6. Step 6: Final answer
   x = 90,056.80