Finding the Third Proportional to 578,880 and 1,240,830

Step by Step Solution

1. Step 1: Write the proportion equation
   578,880 : 1,240,830 = 1,240,830 : x
2. Step 2: Convert to fraction form
   578,880/1,240,830 = 1,240,830/x
3. Step 3: Cross multiply
   578,880x = 1,240,830 × 1,240,830
4. Step 4: Simplify right side
   578,880x = 1,539,659,088,900
5. Step 5: Solve for x
   x = 1,539,659,088,900/578,880
6. Step 6: Final answer
   x = 2,659,720.65