Finding the Third Proportional to 99,555 and 216,607.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,555 : 216,607.50 = 216,607.50 : x
2. Step 2: Convert to fraction form
   99,555/216,607.50 = 216,607.50/x
3. Step 3: Cross multiply
   99,555x = 216,607.50 × 216,607.50
4. Step 4: Simplify right side
   99,555x = 46,918,809,056.25
5. Step 5: Solve for x
   x = 46,918,809,056.25/99,555
6. Step 6: Final answer
   x = 471,285.31