Finding the Third Proportional to 356,881.50 and 521,077.50

Step by Step Solution

1. Step 1: Write the proportion equation
   356,881.50 : 521,077.50 = 521,077.50 : x
2. Step 2: Convert to fraction form
   356,881.50/521,077.50 = 521,077.50/x
3. Step 3: Cross multiply
   356,881.50x = 521,077.50 × 521,077.50
4. Step 4: Simplify right side
   356,881.50x = 271,521,761,006.25
5. Step 5: Solve for x
   x = 271,521,761,006.25/356,881.50
6. Step 6: Final answer
   x = 760,817.70