Finding the Third Proportional to 177,939 and 391,528.50

Step by Step Solution

1. Step 1: Write the proportion equation
   177,939 : 391,528.50 = 391,528.50 : x
2. Step 2: Convert to fraction form
   177,939/391,528.50 = 391,528.50/x
3. Step 3: Cross multiply
   177,939x = 391,528.50 × 391,528.50
4. Step 4: Simplify right side
   177,939x = 153,294,566,312.25
5. Step 5: Solve for x
   x = 153,294,566,312.25/177,939
6. Step 6: Final answer
   x = 861,500.66