Finding the Third Proportional to 398,784 and 612,959.63

Step by Step Solution

1. Step 1: Write the proportion equation
   398,784 : 612,959.63 = 612,959.63 : x
2. Step 2: Convert to fraction form
   398,784/612,959.63 = 612,959.63/x
3. Step 3: Cross multiply
   398,784x = 612,959.63 × 612,959.63
4. Step 4: Simplify right side
   398,784x = 375,719,501,880.14
5. Step 5: Solve for x
   x = 375,719,501,880.14/398,784
6. Step 6: Final answer
   x = 942,162.93