Finding the Third Proportional to 390,082.50 and 811,093.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,082.50 : 811,093.50 = 811,093.50 : x
2. Step 2: Convert to fraction form
   390,082.50/811,093.50 = 811,093.50/x
3. Step 3: Cross multiply
   390,082.50x = 811,093.50 × 811,093.50
4. Step 4: Simplify right side
   390,082.50x = 657,872,665,742.25
5. Step 5: Solve for x
   x = 657,872,665,742.25/390,082.50
6. Step 6: Final answer
   x = 1,686,496.23