Finding the Fourth Proportional to 128,938.06, 177,937.59 and 72,353.62

Step by Step Solution

1. Step 1: Write the proportion equation
   128,938.06 : 177,937.59 = 72,353.62 : x
2. Step 2: Convert to fraction form
   128,938.06/177,937.59 = 72,353.62/x
3. Step 3: Cross multiply
   128,938.06x = 177,937.59 × 72,353.62
4. Step 4: Simplify right side
   128,938.06x = 12,874,428,770.58
5. Step 5: Solve for x
   x = 12,874,428,770.58/128,938.06
6. Step 6: Final answer
   x = 99,849.72