Finding the Fourth Proportional to 72,196.76, 99,628.61 and 39,929.25

Step by Step Solution

1. Step 1: Write the proportion equation
   72,196.76 : 99,628.61 = 39,929.25 : x
2. Step 2: Convert to fraction form
   72,196.76/99,628.61 = 39,929.25/x
3. Step 3: Cross multiply
   72,196.76x = 99,628.61 × 39,929.25
4. Step 4: Simplify right side
   72,196.76x = 3,978,095,476.20
5. Step 5: Solve for x
   x = 3,978,095,476.20/72,196.76
6. Step 6: Final answer
   x = 55,100.75