Finding the Third Proportional to 428,557.50 and 921,611

Step by Step Solution

1. Step 1: Write the proportion equation
   428,557.50 : 921,611 = 921,611 : x
2. Step 2: Convert to fraction form
   428,557.50/921,611 = 921,611/x
3. Step 3: Cross multiply
   428,557.50x = 921,611 × 921,611
4. Step 4: Simplify right side
   428,557.50x = 849,366,835,321
5. Step 5: Solve for x
   x = 849,366,835,321/428,557.50
6. Step 6: Final answer
   x = 1,981,920.36