Finding the Third Proportional to 391,677 and 528,465.50

Step by Step Solution

1. Step 1: Write the proportion equation
   391,677 : 528,465.50 = 528,465.50 : x
2. Step 2: Convert to fraction form
   391,677/528,465.50 = 528,465.50/x
3. Step 3: Cross multiply
   391,677x = 528,465.50 × 528,465.50
4. Step 4: Simplify right side
   391,677x = 279,275,784,690.25
5. Step 5: Solve for x
   x = 279,275,784,690.25/391,677
6. Step 6: Final answer
   x = 713,025.74