Finding the Third Proportional to 1,578,290 and 3,478,312

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578,290 : 3,478,312 = 3,478,312 : x
2. Step 2: Convert to fraction form
   1,578,290/3,478,312 = 3,478,312/x
3. Step 3: Cross multiply
   1,578,290x = 3,478,312 × 3,478,312
4. Step 4: Simplify right side
   1,578,290x = 12,098,654,369,344
5. Step 5: Solve for x
   x = 12,098,654,369,344/1,578,290
6. Step 6: Final answer
   x = 7,665,672.58