Finding the Third Proportional to 99,816.50 and 216,420.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,816.50 : 216,420.50 = 216,420.50 : x
2. Step 2: Convert to fraction form
   99,816.50/216,420.50 = 216,420.50/x
3. Step 3: Cross multiply
   99,816.50x = 216,420.50 × 216,420.50
4. Step 4: Simplify right side
   99,816.50x = 46,837,832,820.25
5. Step 5: Solve for x
   x = 46,837,832,820.25/99,816.50
6. Step 6: Final answer
   x = 469,239.38