Finding the Third Proportional to 1,921,390.50 and 4,139,686.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921,390.50 : 4,139,686.50 = 4,139,686.50 : x
2. Step 2: Convert to fraction form
   1,921,390.50/4,139,686.50 = 4,139,686.50/x
3. Step 3: Cross multiply
   1,921,390.50x = 4,139,686.50 × 4,139,686.50
4. Step 4: Simplify right side
   1,921,390.50x = 17,137,004,318,282.25
5. Step 5: Solve for x
   x = 17,137,004,318,282.25/1,921,390.50
6. Step 6: Final answer
   x = 8,919,063.73