Finding the Third Proportional to 315,390 and 471,779.25

Step by Step Solution

1. Step 1: Write the proportion equation
   315,390 : 471,779.25 = 471,779.25 : x
2. Step 2: Convert to fraction form
   315,390/471,779.25 = 471,779.25/x
3. Step 3: Cross multiply
   315,390x = 471,779.25 × 471,779.25
4. Step 4: Simplify right side
   315,390x = 222,575,660,730.56
5. Step 5: Solve for x
   x = 222,575,660,730.56/315,390
6. Step 6: Final answer
   x = 705,715.66