Finding the Third Proportional to 128,558.81 and 192,716.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,558.81 : 192,716.72 = 192,716.72 : x
2. Step 2: Convert to fraction form
   128,558.81/192,716.72 = 192,716.72/x
3. Step 3: Cross multiply
   128,558.81x = 192,716.72 × 192,716.72
4. Step 4: Simplify right side
   128,558.81x = 37,139,733,685.77
5. Step 5: Solve for x
   x = 37,139,733,685.77/128,558.81
6. Step 6: Final answer
   x = 288,892.94