Finding the Fourth Proportional to 1,391,660.16, 1,920,511.56 and 810,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,660.16 : 1,920,511.56 = 810,870.72 : x
2. Step 2: Convert to fraction form
   1,391,660.16/1,920,511.56 = 810,870.72/x
3. Step 3: Cross multiply
   1,391,660.16x = 1,920,511.56 × 810,870.72
4. Step 4: Simplify right side
   1,391,660.16x = 1,557,286,591,425.52
5. Step 5: Solve for x
   x = 1,557,286,591,425.52/1,391,660.16
6. Step 6: Final answer
   x = 1,119,013.56