Finding the Third Proportional to 643,490 and 846,195

Step by Step Solution

1. Step 1: Write the proportion equation
   643,490 : 846,195 = 846,195 : x
2. Step 2: Convert to fraction form
   643,490/846,195 = 846,195/x
3. Step 3: Cross multiply
   643,490x = 846,195 × 846,195
4. Step 4: Simplify right side
   643,490x = 716,045,978,025
5. Step 5: Solve for x
   x = 716,045,978,025/643,490
6. Step 6: Final answer
   x = 1,112,753.85