Finding the Third Proportional to 136,570 and 279,890

Step by Step Solution

1. Step 1: Write the proportion equation
   136,570 : 279,890 = 279,890 : x
2. Step 2: Convert to fraction form
   136,570/279,890 = 279,890/x
3. Step 3: Cross multiply
   136,570x = 279,890 × 279,890
4. Step 4: Simplify right side
   136,570x = 78,338,412,100
5. Step 5: Solve for x
   x = 78,338,412,100/136,570
6. Step 6: Final answer
   x = 573,613.62