Finding the Third Proportional to 210,117 and 315,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   210,117 : 315,390.50 = 315,390.50 : x
2. Step 2: Convert to fraction form
   210,117/315,390.50 = 315,390.50/x
3. Step 3: Cross multiply
   210,117x = 315,390.50 × 315,390.50
4. Step 4: Simplify right side
   210,117x = 99,471,167,490.25
5. Step 5: Solve for x
   x = 99,471,167,490.25/210,117
6. Step 6: Final answer
   x = 473,408.47