Finding the Third Proportional to 12,991.50 and 28,167.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.50 : 28,167.75 = 28,167.75 : x
2. Step 2: Convert to fraction form
   12,991.50/28,167.75 = 28,167.75/x
3. Step 3: Cross multiply
   12,991.50x = 28,167.75 × 28,167.75
4. Step 4: Simplify right side
   12,991.50x = 793,422,140.06
5. Step 5: Solve for x
   x = 793,422,140.06/12,991.50
6. Step 6: Final answer
   x = 61,072.40