Finding the Third Proportional to 155,436 and 278,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,436 : 278,890.50 = 278,890.50 : x
2. Step 2: Convert to fraction form
   155,436/278,890.50 = 278,890.50/x
3. Step 3: Cross multiply
   155,436x = 278,890.50 × 278,890.50
4. Step 4: Simplify right side
   155,436x = 77,779,910,990.25
5. Step 5: Solve for x
   x = 77,779,910,990.25/155,436
6. Step 6: Final answer
   x = 500,398.31