Finding the Third Proportional to 128,109.75 and 272,851.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,109.75 : 272,851.50 = 272,851.50 : x
2. Step 2: Convert to fraction form
   128,109.75/272,851.50 = 272,851.50/x
3. Step 3: Cross multiply
   128,109.75x = 272,851.50 × 272,851.50
4. Step 4: Simplify right side
   128,109.75x = 74,447,941,052.25
5. Step 5: Solve for x
   x = 74,447,941,052.25/128,109.75
6. Step 6: Final answer
   x = 581,126.27