Finding the Third Proportional to 402,299 and 554,171.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,299 : 554,171.50 = 554,171.50 : x
2. Step 2: Convert to fraction form
   402,299/554,171.50 = 554,171.50/x
3. Step 3: Cross multiply
   402,299x = 554,171.50 × 554,171.50
4. Step 4: Simplify right side
   402,299x = 307,106,051,412.25
5. Step 5: Solve for x
   x = 307,106,051,412.25/402,299
6. Step 6: Final answer
   x = 763,377.62