Finding the Third Proportional to 90,154.50 and 139,590.75

Step by Step Solution

1. Step 1: Write the proportion equation
   90,154.50 : 139,590.75 = 139,590.75 : x
2. Step 2: Convert to fraction form
   90,154.50/139,590.75 = 139,590.75/x
3. Step 3: Cross multiply
   90,154.50x = 139,590.75 × 139,590.75
4. Step 4: Simplify right side
   90,154.50x = 19,485,577,485.56
5. Step 5: Solve for x
   x = 19,485,577,485.56/90,154.50
6. Step 6: Final answer
   x = 216,135.38