Finding the Third Proportional to 59,985.75 and 138,870.38

Step by Step Solution

1. Step 1: Write the proportion equation
   59,985.75 : 138,870.38 = 138,870.38 : x
2. Step 2: Convert to fraction form
   59,985.75/138,870.38 = 138,870.38/x
3. Step 3: Cross multiply
   59,985.75x = 138,870.38 × 138,870.38
4. Step 4: Simplify right side
   59,985.75x = 19,284,981,052.64
5. Step 5: Solve for x
   x = 19,284,981,052.64/59,985.75
6. Step 6: Final answer
   x = 321,492.71