Finding the Third Proportional to 148,978 and 212,816.75

Step by Step Solution

1. Step 1: Write the proportion equation
   148,978 : 212,816.75 = 212,816.75 : x
2. Step 2: Convert to fraction form
   148,978/212,816.75 = 212,816.75/x
3. Step 3: Cross multiply
   148,978x = 212,816.75 × 212,816.75
4. Step 4: Simplify right side
   148,978x = 45,290,969,080.56
5. Step 5: Solve for x
   x = 45,290,969,080.56/148,978
6. Step 6: Final answer
   x = 304,011.12