Finding the Fourth Proportional to 128,949.80, 177,938.82 and 72,350.76

Step by Step Solution

1. Step 1: Write the proportion equation
   128,949.80 : 177,938.82 = 72,350.76 : x
2. Step 2: Convert to fraction form
   128,949.80/177,938.82 = 72,350.76/x
3. Step 3: Cross multiply
   128,949.80x = 177,938.82 × 72,350.76
4. Step 4: Simplify right side
   128,949.80x = 12,874,008,860.50
5. Step 5: Solve for x
   x = 12,874,008,860.50/128,949.80
6. Step 6: Final answer
   x = 99,837.37