Finding the Third Proportional to 1,391,121 and 2,931,670

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,121 : 2,931,670 = 2,931,670 : x
2. Step 2: Convert to fraction form
   1,391,121/2,931,670 = 2,931,670/x
3. Step 3: Cross multiply
   1,391,121x = 2,931,670 × 2,931,670
4. Step 4: Simplify right side
   1,391,121x = 8,594,688,988,900
5. Step 5: Solve for x
   x = 8,594,688,988,900/1,391,121
6. Step 6: Final answer
   x = 6,178,246.89