Finding the Third Proportional to 64,690.50 and 141,405

Step by Step Solution

1. Step 1: Write the proportion equation
   64,690.50 : 141,405 = 141,405 : x
2. Step 2: Convert to fraction form
   64,690.50/141,405 = 141,405/x
3. Step 3: Cross multiply
   64,690.50x = 141,405 × 141,405
4. Step 4: Simplify right side
   64,690.50x = 19,995,374,025
5. Step 5: Solve for x
   x = 19,995,374,025/64,690.50
6. Step 6: Final answer
   x = 309,092.90