Finding the Third Proportional to 128,808 and 189,480.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,808 : 189,480.50 = 189,480.50 : x
2. Step 2: Convert to fraction form
   128,808/189,480.50 = 189,480.50/x
3. Step 3: Cross multiply
   128,808x = 189,480.50 × 189,480.50
4. Step 4: Simplify right side
   128,808x = 35,902,859,880.25
5. Step 5: Solve for x
   x = 35,902,859,880.25/128,808
6. Step 6: Final answer
   x = 278,731.60