Finding the Third Proportional to 178,069.50 and 391,131

Step by Step Solution

1. Step 1: Write the proportion equation
   178,069.50 : 391,131 = 391,131 : x
2. Step 2: Convert to fraction form
   178,069.50/391,131 = 391,131/x
3. Step 3: Cross multiply
   178,069.50x = 391,131 × 391,131
4. Step 4: Simplify right side
   178,069.50x = 152,983,459,161
5. Step 5: Solve for x
   x = 152,983,459,161/178,069.50
6. Step 6: Final answer
   x = 859,122.19