Finding the Fourth Proportional to 1,376.36, 1,899.30 and 786.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.36 : 1,899.30 = 786.82 : x
2. Step 2: Convert to fraction form
   1,376.36/1,899.30 = 786.82/x
3. Step 3: Cross multiply
   1,376.36x = 1,899.30 × 786.82
4. Step 4: Simplify right side
   1,376.36x = 1,494,407.23
5. Step 5: Solve for x
   x = 1,494,407.23/1,376.36
6. Step 6: Final answer
   x = 1,085.77