Finding the Fourth Proportional to 1,376.14, 1,899.10 and 786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.14 : 1,899.10 = 786.72 : x
2. Step 2: Convert to fraction form
   1,376.14/1,899.10 = 786.72/x
3. Step 3: Cross multiply
   1,376.14x = 1,899.10 × 786.72
4. Step 4: Simplify right side
   1,376.14x = 1,494,059.95
5. Step 5: Solve for x
   x = 1,494,059.95/1,376.14
6. Step 6: Final answer
   x = 1,085.69