Finding the Fourth Proportional to 1,410.81, 1,946.88 and 789.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.81 : 1,946.88 = 789.81 : x
2. Step 2: Convert to fraction form
   1,410.81/1,946.88 = 789.81/x
3. Step 3: Cross multiply
   1,410.81x = 1,946.88 × 789.81
4. Step 4: Simplify right side
   1,410.81x = 1,537,665.29
5. Step 5: Solve for x
   x = 1,537,665.29/1,410.81
6. Step 6: Final answer
   x = 1,089.92