Finding the Third Proportional to 266,436 and 405,121.50

Step by Step Solution

1. Step 1: Write the proportion equation
   266,436 : 405,121.50 = 405,121.50 : x
2. Step 2: Convert to fraction form
   266,436/405,121.50 = 405,121.50/x
3. Step 3: Cross multiply
   266,436x = 405,121.50 × 405,121.50
4. Step 4: Simplify right side
   266,436x = 164,123,429,762.25
5. Step 5: Solve for x
   x = 164,123,429,762.25/266,436
6. Step 6: Final answer
   x = 615,995.70