Finding the Fourth Proportional to 105,635.52, 145,778.88 and 72,112.32

Step by Step Solution

1. Step 1: Write the proportion equation
   105,635.52 : 145,778.88 = 72,112.32 : x
2. Step 2: Convert to fraction form
   105,635.52/145,778.88 = 72,112.32/x
3. Step 3: Cross multiply
   105,635.52x = 145,778.88 × 72,112.32
4. Step 4: Simplify right side
   105,635.52x = 10,512,453,243.80
5. Step 5: Solve for x
   x = 10,512,453,243.80/105,635.52
6. Step 6: Final answer
   x = 99,516.27