Finding the Third Proportional to 453,990.50 and 636,254

Step by Step Solution

1. Step 1: Write the proportion equation
   453,990.50 : 636,254 = 636,254 : x
2. Step 2: Convert to fraction form
   453,990.50/636,254 = 636,254/x
3. Step 3: Cross multiply
   453,990.50x = 636,254 × 636,254
4. Step 4: Simplify right side
   453,990.50x = 404,819,152,516
5. Step 5: Solve for x
   x = 404,819,152,516/453,990.50
6. Step 6: Final answer
   x = 891,690.80