Finding the Fourth Proportional to 105,128.62, 145,076.88 and 59,806.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,128.62 : 145,076.88 = 59,806.50 : x
2. Step 2: Convert to fraction form
   105,128.62/145,076.88 = 59,806.50/x
3. Step 3: Cross multiply
   105,128.62x = 145,076.88 × 59,806.50
4. Step 4: Simplify right side
   105,128.62x = 8,676,540,423.72
5. Step 5: Solve for x
   x = 8,676,540,423.72/105,128.62
6. Step 6: Final answer
   x = 82,532.62