Finding the Third Proportional to 116,139 and 254,421

Step by Step Solution

1. Step 1: Write the proportion equation
   116,139 : 254,421 = 254,421 : x
2. Step 2: Convert to fraction form
   116,139/254,421 = 254,421/x
3. Step 3: Cross multiply
   116,139x = 254,421 × 254,421
4. Step 4: Simplify right side
   116,139x = 64,730,045,241
5. Step 5: Solve for x
   x = 64,730,045,241/116,139
6. Step 6: Final answer
   x = 557,349.77