Finding the Third Proportional to 131,178 and 286,980

Step by Step Solution

1. Step 1: Write the proportion equation
   131,178 : 286,980 = 286,980 : x
2. Step 2: Convert to fraction form
   131,178/286,980 = 286,980/x
3. Step 3: Cross multiply
   131,178x = 286,980 × 286,980
4. Step 4: Simplify right side
   131,178x = 82,357,520,400
5. Step 5: Solve for x
   x = 82,357,520,400/131,178
6. Step 6: Final answer
   x = 627,830.28