Finding the Third Proportional to 100,890.56 and 216,270

Step by Step Solution

1. Step 1: Write the proportion equation
   100,890.56 : 216,270 = 216,270 : x
2. Step 2: Convert to fraction form
   100,890.56/216,270 = 216,270/x
3. Step 3: Cross multiply
   100,890.56x = 216,270 × 216,270
4. Step 4: Simplify right side
   100,890.56x = 46,772,712,900
5. Step 5: Solve for x
   x = 46,772,712,900/100,890.56
6. Step 6: Final answer
   x = 463,598.49