Finding the Third Proportional to 139,089 and 209,281.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,089 : 209,281.50 = 209,281.50 : x
2. Step 2: Convert to fraction form
   139,089/209,281.50 = 209,281.50/x
3. Step 3: Cross multiply
   139,089x = 209,281.50 × 209,281.50
4. Step 4: Simplify right side
   139,089x = 43,798,746,242.25
5. Step 5: Solve for x
   x = 43,798,746,242.25/139,089
6. Step 6: Final answer
   x = 314,897.27