Finding the Third Proportional to 68,890.50 and 72,991.13

Step by Step Solution

1. Step 1: Write the proportion equation
   68,890.50 : 72,991.13 = 72,991.13 : x
2. Step 2: Convert to fraction form
   68,890.50/72,991.13 = 72,991.13/x
3. Step 3: Cross multiply
   68,890.50x = 72,991.13 × 72,991.13
4. Step 4: Simplify right side
   68,890.50x = 5,327,704,328.77
5. Step 5: Solve for x
   x = 5,327,704,328.77/68,890.50
6. Step 6: Final answer
   x = 77,335.83