Finding the Third Proportional to 398,790 and 612,970.88

Step by Step Solution

1. Step 1: Write the proportion equation
   398,790 : 612,970.88 = 612,970.88 : x
2. Step 2: Convert to fraction form
   398,790/612,970.88 = 612,970.88/x
3. Step 3: Cross multiply
   398,790x = 612,970.88 × 612,970.88
4. Step 4: Simplify right side
   398,790x = 375,733,293,598.27
5. Step 5: Solve for x
   x = 375,733,293,598.27/398,790
6. Step 6: Final answer
   x = 942,183.34