Finding the Third Proportional to 12,991 and 28,056

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991 : 28,056 = 28,056 : x
2. Step 2: Convert to fraction form
   12,991/28,056 = 28,056/x
3. Step 3: Cross multiply
   12,991x = 28,056 × 28,056
4. Step 4: Simplify right side
   12,991x = 787,139,136
5. Step 5: Solve for x
   x = 787,139,136/12,991
6. Step 6: Final answer
   x = 60,591.11