Finding the Third Proportional to 77,991.50 and 111,531.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,991.50 : 111,531.50 = 111,531.50 : x
2. Step 2: Convert to fraction form
   77,991.50/111,531.50 = 111,531.50/x
3. Step 3: Cross multiply
   77,991.50x = 111,531.50 × 111,531.50
4. Step 4: Simplify right side
   77,991.50x = 12,439,275,492.25
5. Step 5: Solve for x
   x = 12,439,275,492.25/77,991.50
6. Step 6: Final answer
   x = 159,495.27