Finding the Third Proportional to 99,478.13 and 216,270

Step by Step Solution

1. Step 1: Write the proportion equation
   99,478.13 : 216,270 = 216,270 : x
2. Step 2: Convert to fraction form
   99,478.13/216,270 = 216,270/x
3. Step 3: Cross multiply
   99,478.13x = 216,270 × 216,270
4. Step 4: Simplify right side
   99,478.13x = 46,772,712,900
5. Step 5: Solve for x
   x = 46,772,712,900/99,478.13
6. Step 6: Final answer
   x = 470,180.89