Finding the Third Proportional to 155,428.50 and 278,868

Step by Step Solution

1. Step 1: Write the proportion equation
   155,428.50 : 278,868 = 278,868 : x
2. Step 2: Convert to fraction form
   155,428.50/278,868 = 278,868/x
3. Step 3: Cross multiply
   155,428.50x = 278,868 × 278,868
4. Step 4: Simplify right side
   155,428.50x = 77,767,361,424
5. Step 5: Solve for x
   x = 77,767,361,424/155,428.50
6. Step 6: Final answer
   x = 500,341.71