Finding the Third Proportional to 129,381 and 274,139

Step by Step Solution

1. Step 1: Write the proportion equation
   129,381 : 274,139 = 274,139 : x
2. Step 2: Convert to fraction form
   129,381/274,139 = 274,139/x
3. Step 3: Cross multiply
   129,381x = 274,139 × 274,139
4. Step 4: Simplify right side
   129,381x = 75,152,191,321
5. Step 5: Solve for x
   x = 75,152,191,321/129,381
6. Step 6: Final answer
   x = 580,859.56