Finding the Third Proportional to 139,650.75 and 209,430

Step by Step Solution

1. Step 1: Write the proportion equation
   139,650.75 : 209,430 = 209,430 : x
2. Step 2: Convert to fraction form
   139,650.75/209,430 = 209,430/x
3. Step 3: Cross multiply
   139,650.75x = 209,430 × 209,430
4. Step 4: Simplify right side
   139,650.75x = 43,860,924,900
5. Step 5: Solve for x
   x = 43,860,924,900/139,650.75
6. Step 6: Final answer
   x = 314,075.83