Finding the Third Proportional to 398,784.50 and 612,959

Step by Step Solution

1. Step 1: Write the proportion equation
   398,784.50 : 612,959 = 612,959 : x
2. Step 2: Convert to fraction form
   398,784.50/612,959 = 612,959/x
3. Step 3: Cross multiply
   398,784.50x = 612,959 × 612,959
4. Step 4: Simplify right side
   398,784.50x = 375,718,735,681
5. Step 5: Solve for x
   x = 375,718,735,681/398,784.50
6. Step 6: Final answer
   x = 942,159.83