Finding the Third Proportional to 25,430 and 54,139

Step by Step Solution

1. Step 1: Write the proportion equation
   25,430 : 54,139 = 54,139 : x
2. Step 2: Convert to fraction form
   25,430/54,139 = 54,139/x
3. Step 3: Cross multiply
   25,430x = 54,139 × 54,139
4. Step 4: Simplify right side
   25,430x = 2,931,031,321
5. Step 5: Solve for x
   x = 2,931,031,321/25,430
6. Step 6: Final answer
   x = 115,258.80