Finding the Fourth Proportional to 128,768.56, 177,700.05 and 72,179.93

Step by Step Solution

1. Step 1: Write the proportion equation
   128,768.56 : 177,700.05 = 72,179.93 : x
2. Step 2: Convert to fraction form
   128,768.56/177,700.05 = 72,179.93/x
3. Step 3: Cross multiply
   128,768.56x = 177,700.05 × 72,179.93
4. Step 4: Simplify right side
   128,768.56x = 12,826,377,614.25
5. Step 5: Solve for x
   x = 12,826,377,614.25/128,768.56
6. Step 6: Final answer
   x = 99,607.99