Finding the Third Proportional to 155,437.50 and 321,930

Step by Step Solution

1. Step 1: Write the proportion equation
   155,437.50 : 321,930 = 321,930 : x
2. Step 2: Convert to fraction form
   155,437.50/321,930 = 321,930/x
3. Step 3: Cross multiply
   155,437.50x = 321,930 × 321,930
4. Step 4: Simplify right side
   155,437.50x = 103,638,924,900
5. Step 5: Solve for x
   x = 103,638,924,900/155,437.50
6. Step 6: Final answer
   x = 666,756.25