Finding the Third Proportional to 315,029.25 and 691,290

Step by Step Solution

1. Step 1: Write the proportion equation
   315,029.25 : 691,290 = 691,290 : x
2. Step 2: Convert to fraction form
   315,029.25/691,290 = 691,290/x
3. Step 3: Cross multiply
   315,029.25x = 691,290 × 691,290
4. Step 4: Simplify right side
   315,029.25x = 477,881,864,100
5. Step 5: Solve for x
   x = 477,881,864,100/315,029.25
6. Step 6: Final answer
   x = 1,516,944.42