Finding the Fourth Proportional to 128,950.56, 177,964.56 and 72,362.16

Step by Step Solution

1. Step 1: Write the proportion equation
   128,950.56 : 177,964.56 = 72,362.16 : x
2. Step 2: Convert to fraction form
   128,950.56/177,964.56 = 72,362.16/x
3. Step 3: Cross multiply
   128,950.56x = 177,964.56 × 72,362.16
4. Step 4: Simplify right side
   128,950.56x = 12,877,899,965.05
5. Step 5: Solve for x
   x = 12,877,899,965.05/128,950.56
6. Step 6: Final answer
   x = 99,866.96