Finding the Third Proportional to 415,219.50 and 620,658

Step by Step Solution

1. Step 1: Write the proportion equation
   415,219.50 : 620,658 = 620,658 : x
2. Step 2: Convert to fraction form
   415,219.50/620,658 = 620,658/x
3. Step 3: Cross multiply
   415,219.50x = 620,658 × 620,658
4. Step 4: Simplify right side
   415,219.50x = 385,216,352,964
5. Step 5: Solve for x
   x = 385,216,352,964/415,219.50
6. Step 6: Final answer
   x = 927,741.48