Finding the Third Proportional to 611,719.50 and 921,117

Step by Step Solution

1. Step 1: Write the proportion equation
   611,719.50 : 921,117 = 921,117 : x
2. Step 2: Convert to fraction form
   611,719.50/921,117 = 921,117/x
3. Step 3: Cross multiply
   611,719.50x = 921,117 × 921,117
4. Step 4: Simplify right side
   611,719.50x = 848,456,527,689
5. Step 5: Solve for x
   x = 848,456,527,689/611,719.50
6. Step 6: Final answer
   x = 1,387,002.58