Finding the Third Proportional to 371,139.25 and 813,211.50

Step by Step Solution

1. Step 1: Write the proportion equation
   371,139.25 : 813,211.50 = 813,211.50 : x
2. Step 2: Convert to fraction form
   371,139.25/813,211.50 = 813,211.50/x
3. Step 3: Cross multiply
   371,139.25x = 813,211.50 × 813,211.50
4. Step 4: Simplify right side
   371,139.25x = 661,312,943,732.25
5. Step 5: Solve for x
   x = 661,312,943,732.25/371,139.25
6. Step 6: Final answer
   x = 1,781,845.88