Finding the Third Proportional to 831,688 and 1,287,276

Step by Step Solution

1. Step 1: Write the proportion equation
   831,688 : 1,287,276 = 1,287,276 : x
2. Step 2: Convert to fraction form
   831,688/1,287,276 = 1,287,276/x
3. Step 3: Cross multiply
   831,688x = 1,287,276 × 1,287,276
4. Step 4: Simplify right side
   831,688x = 1,657,079,500,176
5. Step 5: Solve for x
   x = 1,657,079,500,176/831,688
6. Step 6: Final answer
   x = 1,992,429.25