Finding the Third Proportional to 428,556.50 and 921,609

Step by Step Solution

1. Step 1: Write the proportion equation
   428,556.50 : 921,609 = 921,609 : x
2. Step 2: Convert to fraction form
   428,556.50/921,609 = 921,609/x
3. Step 3: Cross multiply
   428,556.50x = 921,609 × 921,609
4. Step 4: Simplify right side
   428,556.50x = 849,363,148,881
5. Step 5: Solve for x
   x = 849,363,148,881/428,556.50
6. Step 6: Final answer
   x = 1,981,916.38