Finding the Third Proportional to 129,705.50 and 279,422

Step by Step Solution

1. Step 1: Write the proportion equation
   129,705.50 : 279,422 = 279,422 : x
2. Step 2: Convert to fraction form
   129,705.50/279,422 = 279,422/x
3. Step 3: Cross multiply
   129,705.50x = 279,422 × 279,422
4. Step 4: Simplify right side
   129,705.50x = 78,076,654,084
5. Step 5: Solve for x
   x = 78,076,654,084/129,705.50
6. Step 6: Final answer
   x = 601,953.30