Finding the Third Proportional to 679,140 and 919,056

Step by Step Solution

1. Step 1: Write the proportion equation
   679,140 : 919,056 = 919,056 : x
2. Step 2: Convert to fraction form
   679,140/919,056 = 919,056/x
3. Step 3: Cross multiply
   679,140x = 919,056 × 919,056
4. Step 4: Simplify right side
   679,140x = 844,663,931,136
5. Step 5: Solve for x
   x = 844,663,931,136/679,140
6. Step 6: Final answer
   x = 1,243,725.79