Finding the Third Proportional to 90,902.50 and 212,310

Step by Step Solution

1. Step 1: Write the proportion equation
   90,902.50 : 212,310 = 212,310 : x
2. Step 2: Convert to fraction form
   90,902.50/212,310 = 212,310/x
3. Step 3: Cross multiply
   90,902.50x = 212,310 × 212,310
4. Step 4: Simplify right side
   90,902.50x = 45,075,536,100
5. Step 5: Solve for x
   x = 45,075,536,100/90,902.50
6. Step 6: Final answer
   x = 495,866.85