Finding the Third Proportional to 140,490 and 215,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   140,490 : 215,428.50 = 215,428.50 : x
2. Step 2: Convert to fraction form
   140,490/215,428.50 = 215,428.50/x
3. Step 3: Cross multiply
   140,490x = 215,428.50 × 215,428.50
4. Step 4: Simplify right side
   140,490x = 46,409,438,612.25
5. Step 5: Solve for x
   x = 46,409,438,612.25/140,490
6. Step 6: Final answer
   x = 330,339.80