Finding the Third Proportional to 215,155.50 and 315,117

Step by Step Solution

1. Step 1: Write the proportion equation
   215,155.50 : 315,117 = 315,117 : x
2. Step 2: Convert to fraction form
   215,155.50/315,117 = 315,117/x
3. Step 3: Cross multiply
   215,155.50x = 315,117 × 315,117
4. Step 4: Simplify right side
   215,155.50x = 99,298,723,689
5. Step 5: Solve for x
   x = 99,298,723,689/215,155.50
6. Step 6: Final answer
   x = 461,520.73