Finding the Third Proportional to 99,240 and 216,300

Step by Step Solution

1. Step 1: Write the proportion equation
   99,240 : 216,300 = 216,300 : x
2. Step 2: Convert to fraction form
   99,240/216,300 = 216,300/x
3. Step 3: Cross multiply
   99,240x = 216,300 × 216,300
4. Step 4: Simplify right side
   99,240x = 46,785,690,000
5. Step 5: Solve for x
   x = 46,785,690,000/99,240
6. Step 6: Final answer
   x = 471,439.84