Finding the Third Proportional to 490,860 and 720,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   490,860 : 720,130.50 = 720,130.50 : x
2. Step 2: Convert to fraction form
   490,860/720,130.50 = 720,130.50/x
3. Step 3: Cross multiply
   490,860x = 720,130.50 × 720,130.50
4. Step 4: Simplify right side
   490,860x = 518,587,937,030.25
5. Step 5: Solve for x
   x = 518,587,937,030.25/490,860
6. Step 6: Final answer
   x = 1,056,488.48