Finding the Third Proportional to 402,279.50 and 554,144

Step by Step Solution

1. Step 1: Write the proportion equation
   402,279.50 : 554,144 = 554,144 : x
2. Step 2: Convert to fraction form
   402,279.50/554,144 = 554,144/x
3. Step 3: Cross multiply
   402,279.50x = 554,144 × 554,144
4. Step 4: Simplify right side
   402,279.50x = 307,075,572,736
5. Step 5: Solve for x
   x = 307,075,572,736/402,279.50
6. Step 6: Final answer
   x = 763,338.85