Finding the Third Proportional to 118,228.50 and 259,431

Step by Step Solution

1. Step 1: Write the proportion equation
   118,228.50 : 259,431 = 259,431 : x
2. Step 2: Convert to fraction form
   118,228.50/259,431 = 259,431/x
3. Step 3: Cross multiply
   118,228.50x = 259,431 × 259,431
4. Step 4: Simplify right side
   118,228.50x = 67,304,443,761
5. Step 5: Solve for x
   x = 67,304,443,761/118,228.50
6. Step 6: Final answer
   x = 569,274.28