Finding the Third Proportional to 328,290 and 705,622.50

Step by Step Solution

1. Step 1: Write the proportion equation
   328,290 : 705,622.50 = 705,622.50 : x
2. Step 2: Convert to fraction form
   328,290/705,622.50 = 705,622.50/x
3. Step 3: Cross multiply
   328,290x = 705,622.50 × 705,622.50
4. Step 4: Simplify right side
   328,290x = 497,903,112,506.25
5. Step 5: Solve for x
   x = 497,903,112,506.25/328,290
6. Step 6: Final answer
   x = 1,516,656.35