Finding the Third Proportional to 129,085.50 and 279,615

Step by Step Solution

1. Step 1: Write the proportion equation
   129,085.50 : 279,615 = 279,615 : x
2. Step 2: Convert to fraction form
   129,085.50/279,615 = 279,615/x
3. Step 3: Cross multiply
   129,085.50x = 279,615 × 279,615
4. Step 4: Simplify right side
   129,085.50x = 78,184,548,225
5. Step 5: Solve for x
   x = 78,184,548,225/129,085.50
6. Step 6: Final answer
   x = 605,680.33