Finding the Third Proportional to 128,099.25 and 275,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,099.25 : 275,152.50 = 275,152.50 : x
2. Step 2: Convert to fraction form
   128,099.25/275,152.50 = 275,152.50/x
3. Step 3: Cross multiply
   128,099.25x = 275,152.50 × 275,152.50
4. Step 4: Simplify right side
   128,099.25x = 75,708,898,256.25
5. Step 5: Solve for x
   x = 75,708,898,256.25/128,099.25
6. Step 6: Final answer
   x = 591,017.50