Finding the Third Proportional to 128,812.50 and 279,804

Step by Step Solution

1. Step 1: Write the proportion equation
   128,812.50 : 279,804 = 279,804 : x
2. Step 2: Convert to fraction form
   128,812.50/279,804 = 279,804/x
3. Step 3: Cross multiply
   128,812.50x = 279,804 × 279,804
4. Step 4: Simplify right side
   128,812.50x = 78,290,278,416
5. Step 5: Solve for x
   x = 78,290,278,416/128,812.50
6. Step 6: Final answer
   x = 607,784.79