Finding the Fourth Proportional to 1,407.91, 1,942.91 and 786.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.91 : 1,942.91 = 786.91 : x
2. Step 2: Convert to fraction form
   1,407.91/1,942.91 = 786.91/x
3. Step 3: Cross multiply
   1,407.91x = 1,942.91 × 786.91
4. Step 4: Simplify right side
   1,407.91x = 1,528,885.59
5. Step 5: Solve for x
   x = 1,528,885.59/1,407.91
6. Step 6: Final answer
   x = 1,085.93