Finding the Third Proportional to 90,621 and 137,929.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,621 : 137,929.50 = 137,929.50 : x
2. Step 2: Convert to fraction form
   90,621/137,929.50 = 137,929.50/x
3. Step 3: Cross multiply
   90,621x = 137,929.50 × 137,929.50
4. Step 4: Simplify right side
   90,621x = 19,024,546,970.25
5. Step 5: Solve for x
   x = 19,024,546,970.25/90,621
6. Step 6: Final answer
   x = 209,935.30