Finding the Third Proportional to 551,061 and 851,145

Step by Step Solution

1. Step 1: Write the proportion equation
   551,061 : 851,145 = 851,145 : x
2. Step 2: Convert to fraction form
   551,061/851,145 = 851,145/x
3. Step 3: Cross multiply
   551,061x = 851,145 × 851,145
4. Step 4: Simplify right side
   551,061x = 724,447,811,025
5. Step 5: Solve for x
   x = 724,447,811,025/551,061
6. Step 6: Final answer
   x = 1,314,641.77