Finding the Third Proportional to 455,310 and 668,203.50

Step by Step Solution

1. Step 1: Write the proportion equation
   455,310 : 668,203.50 = 668,203.50 : x
2. Step 2: Convert to fraction form
   455,310/668,203.50 = 668,203.50/x
3. Step 3: Cross multiply
   455,310x = 668,203.50 × 668,203.50
4. Step 4: Simplify right side
   455,310x = 446,495,917,412.25
5. Step 5: Solve for x
   x = 446,495,917,412.25/455,310
6. Step 6: Final answer
   x = 980,641.58