Finding the Third Proportional to 258,117 and 391,060.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,117 : 391,060.50 = 391,060.50 : x
2. Step 2: Convert to fraction form
   258,117/391,060.50 = 391,060.50/x
3. Step 3: Cross multiply
   258,117x = 391,060.50 × 391,060.50
4. Step 4: Simplify right side
   258,117x = 152,928,314,660.25
5. Step 5: Solve for x
   x = 152,928,314,660.25/258,117
6. Step 6: Final answer
   x = 592,476.72