Finding the Third Proportional to 69,978 and 149,300

Step by Step Solution

1. Step 1: Write the proportion equation
   69,978 : 149,300 = 149,300 : x
2. Step 2: Convert to fraction form
   69,978/149,300 = 149,300/x
3. Step 3: Cross multiply
   69,978x = 149,300 × 149,300
4. Step 4: Simplify right side
   69,978x = 22,290,490,000
5. Step 5: Solve for x
   x = 22,290,490,000/69,978
6. Step 6: Final answer
   x = 318,535.68