Finding the Third Proportional to 408,060 and 612,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,060 : 612,091.50 = 612,091.50 : x
2. Step 2: Convert to fraction form
   408,060/612,091.50 = 612,091.50/x
3. Step 3: Cross multiply
   408,060x = 612,091.50 × 612,091.50
4. Step 4: Simplify right side
   408,060x = 374,656,004,372.25
5. Step 5: Solve for x
   x = 374,656,004,372.25/408,060
6. Step 6: Final answer
   x = 918,139.50