Finding the Fourth Proportional to 1,376.10, 1,899.15 and 786.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.10 : 1,899.15 = 786.68 : x
2. Step 2: Convert to fraction form
   1,376.10/1,899.15 = 786.68/x
3. Step 3: Cross multiply
   1,376.10x = 1,899.15 × 786.68
4. Step 4: Simplify right side
   1,376.10x = 1,494,023.32
5. Step 5: Solve for x
   x = 1,494,023.32/1,376.10
6. Step 6: Final answer
   x = 1,085.69