Finding the Third Proportional to 128,200.50 and 273,897

Step by Step Solution

1. Step 1: Write the proportion equation
   128,200.50 : 273,897 = 273,897 : x
2. Step 2: Convert to fraction form
   128,200.50/273,897 = 273,897/x
3. Step 3: Cross multiply
   128,200.50x = 273,897 × 273,897
4. Step 4: Simplify right side
   128,200.50x = 75,019,566,609
5. Step 5: Solve for x
   x = 75,019,566,609/128,200.50
6. Step 6: Final answer
   x = 585,173.74