Finding the Fourth Proportional to 128,622.50, 177,499.11 and 72,033.89

Step by Step Solution

1. Step 1: Write the proportion equation
   128,622.50 : 177,499.11 = 72,033.89 : x
2. Step 2: Convert to fraction form
   128,622.50/177,499.11 = 72,033.89/x
3. Step 3: Cross multiply
   128,622.50x = 177,499.11 × 72,033.89
4. Step 4: Simplify right side
   128,622.50x = 12,785,951,364.84
5. Step 5: Solve for x
   x = 12,785,951,364.84/128,622.50
6. Step 6: Final answer
   x = 99,406.80