Finding the Third Proportional to 128,724 and 269,211.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,724 : 269,211.50 = 269,211.50 : x
2. Step 2: Convert to fraction form
   128,724/269,211.50 = 269,211.50/x
3. Step 3: Cross multiply
   128,724x = 269,211.50 × 269,211.50
4. Step 4: Simplify right side
   128,724x = 72,474,831,732.25
5. Step 5: Solve for x
   x = 72,474,831,732.25/128,724
6. Step 6: Final answer
   x = 563,025.01