Finding the Third Proportional to 128,719.50 and 276,810

Step by Step Solution

1. Step 1: Write the proportion equation
   128,719.50 : 276,810 = 276,810 : x
2. Step 2: Convert to fraction form
   128,719.50/276,810 = 276,810/x
3. Step 3: Cross multiply
   128,719.50x = 276,810 × 276,810
4. Step 4: Simplify right side
   128,719.50x = 76,623,776,100
5. Step 5: Solve for x
   x = 76,623,776,100/128,719.50
6. Step 6: Final answer
   x = 595,277.14