Finding the Third Proportional to 128,803.50 and 280,494

Step by Step Solution

1. Step 1: Write the proportion equation
   128,803.50 : 280,494 = 280,494 : x
2. Step 2: Convert to fraction form
   128,803.50/280,494 = 280,494/x
3. Step 3: Cross multiply
   128,803.50x = 280,494 × 280,494
4. Step 4: Simplify right side
   128,803.50x = 78,676,884,036
5. Step 5: Solve for x
   x = 78,676,884,036/128,803.50
6. Step 6: Final answer
   x = 610,828.77