Finding the Fourth Proportional to 1,885.20, 2,828.72 and 789.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,885.20 : 2,828.72 = 789.92 : x
2. Step 2: Convert to fraction form
   1,885.20/2,828.72 = 789.92/x
3. Step 3: Cross multiply
   1,885.20x = 2,828.72 × 789.92
4. Step 4: Simplify right side
   1,885.20x = 2,234,462.50
5. Step 5: Solve for x
   x = 2,234,462.50/1,885.20
6. Step 6: Final answer
   x = 1,185.27