Finding the Third Proportional to 389,490 and 851,076

Step by Step Solution

1. Step 1: Write the proportion equation
   389,490 : 851,076 = 851,076 : x
2. Step 2: Convert to fraction form
   389,490/851,076 = 851,076/x
3. Step 3: Cross multiply
   389,490x = 851,076 × 851,076
4. Step 4: Simplify right side
   389,490x = 724,330,357,776
5. Step 5: Solve for x
   x = 724,330,357,776/389,490
6. Step 6: Final answer
   x = 1,859,689.23