Finding the Third Proportional to 978,688 and 2,156,056

Step by Step Solution

1. Step 1: Write the proportion equation
   978,688 : 2,156,056 = 2,156,056 : x
2. Step 2: Convert to fraction form
   978,688/2,156,056 = 2,156,056/x
3. Step 3: Cross multiply
   978,688x = 2,156,056 × 2,156,056
4. Step 4: Simplify right side
   978,688x = 4,648,577,475,136
5. Step 5: Solve for x
   x = 4,648,577,475,136/978,688
6. Step 6: Final answer
   x = 4,749,805.33