Finding the Third Proportional to 391,189.50 and 857,061

Step by Step Solution

1. Step 1: Write the proportion equation
   391,189.50 : 857,061 = 857,061 : x
2. Step 2: Convert to fraction form
   391,189.50/857,061 = 857,061/x
3. Step 3: Cross multiply
   391,189.50x = 857,061 × 857,061
4. Step 4: Simplify right side
   391,189.50x = 734,553,557,721
5. Step 5: Solve for x
   x = 734,553,557,721/391,189.50
6. Step 6: Final answer
   x = 1,877,743.54