Finding the Third Proportional to 390,158 and 838,516

Step by Step Solution

1. Step 1: Write the proportion equation
   390,158 : 838,516 = 838,516 : x
2. Step 2: Convert to fraction form
   390,158/838,516 = 838,516/x
3. Step 3: Cross multiply
   390,158x = 838,516 × 838,516
4. Step 4: Simplify right side
   390,158x = 703,109,082,256
5. Step 5: Solve for x
   x = 703,109,082,256/390,158
6. Step 6: Final answer
   x = 1,802,113.71