Finding the Third Proportional to 64,490 and 140,492.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,490 : 140,492.50 = 140,492.50 : x
2. Step 2: Convert to fraction form
   64,490/140,492.50 = 140,492.50/x
3. Step 3: Cross multiply
   64,490x = 140,492.50 × 140,492.50
4. Step 4: Simplify right side
   64,490x = 19,738,142,556.25
5. Step 5: Solve for x
   x = 19,738,142,556.25/64,490
6. Step 6: Final answer
   x = 306,065.17