Finding the Third Proportional to 128,809.50 and 189,483

Step by Step Solution

1. Step 1: Write the proportion equation
   128,809.50 : 189,483 = 189,483 : x
2. Step 2: Convert to fraction form
   128,809.50/189,483 = 189,483/x
3. Step 3: Cross multiply
   128,809.50x = 189,483 × 189,483
4. Step 4: Simplify right side
   128,809.50x = 35,903,807,289
5. Step 5: Solve for x
   x = 35,903,807,289/128,809.50
6. Step 6: Final answer
   x = 278,735.71