Finding the Fourth Proportional to 105,425.85, 145,511.03 and 72,766.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,425.85 : 145,511.03 = 72,766.12 : x
2. Step 2: Convert to fraction form
   105,425.85/145,511.03 = 72,766.12/x
3. Step 3: Cross multiply
   105,425.85x = 145,511.03 × 72,766.12
4. Step 4: Simplify right side
   105,425.85x = 10,588,273,570.52
5. Step 5: Solve for x
   x = 10,588,273,570.52/105,425.85
6. Step 6: Final answer
   x = 100,433.37