Finding the Third Proportional to 91,152.50 and 139,920.75

Step by Step Solution

1. Step 1: Write the proportion equation
   91,152.50 : 139,920.75 = 139,920.75 : x
2. Step 2: Convert to fraction form
   91,152.50/139,920.75 = 139,920.75/x
3. Step 3: Cross multiply
   91,152.50x = 139,920.75 × 139,920.75
4. Step 4: Simplify right side
   91,152.50x = 19,577,816,280.56
5. Step 5: Solve for x
   x = 19,577,816,280.56/91,152.50
6. Step 6: Final answer
   x = 214,780.90