Finding the Third Proportional to 355,209.50 and 778,532

Step by Step Solution

1. Step 1: Write the proportion equation
   355,209.50 : 778,532 = 778,532 : x
2. Step 2: Convert to fraction form
   355,209.50/778,532 = 778,532/x
3. Step 3: Cross multiply
   355,209.50x = 778,532 × 778,532
4. Step 4: Simplify right side
   355,209.50x = 606,112,075,024
5. Step 5: Solve for x
   x = 606,112,075,024/355,209.50
6. Step 6: Final answer
   x = 1,706,350.97