Finding the Third Proportional to 302,610 and 455,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   302,610 : 455,221.50 = 455,221.50 : x
2. Step 2: Convert to fraction form
   302,610/455,221.50 = 455,221.50/x
3. Step 3: Cross multiply
   302,610x = 455,221.50 × 455,221.50
4. Step 4: Simplify right side
   302,610x = 207,226,614,062.25
5. Step 5: Solve for x
   x = 207,226,614,062.25/302,610
6. Step 6: Final answer
   x = 684,797.64