Finding the Fourth Proportional to 1,384.47, 1,910.15 and 786.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.47 : 1,910.15 = 786.92 : x
2. Step 2: Convert to fraction form
   1,384.47/1,910.15 = 786.92/x
3. Step 3: Cross multiply
   1,384.47x = 1,910.15 × 786.92
4. Step 4: Simplify right side
   1,384.47x = 1,503,121.75
5. Step 5: Solve for x
   x = 1,503,121.75/1,384.47
6. Step 6: Final answer
   x = 1,085.70