Finding the Third Proportional to 190,691 and 258,979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   190,691 : 258,979.50 = 258,979.50 : x
2. Step 2: Convert to fraction form
   190,691/258,979.50 = 258,979.50/x
3. Step 3: Cross multiply
   190,691x = 258,979.50 × 258,979.50
4. Step 4: Simplify right side
   190,691x = 67,070,381,420.25
5. Step 5: Solve for x
   x = 67,070,381,420.25/190,691
6. Step 6: Final answer
   x = 351,722.85