Finding the Fourth Proportional to 1,386,440.89, 1,912,960.53 and 805,318.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386,440.89 : 1,912,960.53 = 805,318.72 : x
2. Step 2: Convert to fraction form
   1,386,440.89/1,912,960.53 = 805,318.72/x
3. Step 3: Cross multiply
   1,386,440.89x = 1,912,960.53 × 805,318.72
4. Step 4: Simplify right side
   1,386,440.89x = 1,540,542,920,647.72
5. Step 5: Solve for x
   x = 1,540,542,920,647.72/1,386,440.89
6. Step 6: Final answer
   x = 1,111,149.37