Finding the Third Proportional to 380,090 and 818,500

Step by Step Solution

1. Step 1: Write the proportion equation
   380,090 : 818,500 = 818,500 : x
2. Step 2: Convert to fraction form
   380,090/818,500 = 818,500/x
3. Step 3: Cross multiply
   380,090x = 818,500 × 818,500
4. Step 4: Simplify right side
   380,090x = 669,942,250,000
5. Step 5: Solve for x
   x = 669,942,250,000/380,090
6. Step 6: Final answer
   x = 1,762,588.47