Finding the Fourth Proportional to 1,384.08, 1,910.28 and 786.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.08 : 1,910.28 = 786.57 : x
2. Step 2: Convert to fraction form
   1,384.08/1,910.28 = 786.57/x
3. Step 3: Cross multiply
   1,384.08x = 1,910.28 × 786.57
4. Step 4: Simplify right side
   1,384.08x = 1,502,559.39
5. Step 5: Solve for x
   x = 1,502,559.39/1,384.08
6. Step 6: Final answer
   x = 1,085.61