Finding the Fourth Proportional to 1,385.83, 1,911.94 and 847.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.83 : 1,911.94 = 847.28 : x
2. Step 2: Convert to fraction form
   1,385.83/1,911.94 = 847.28/x
3. Step 3: Cross multiply
   1,385.83x = 1,911.94 × 847.28
4. Step 4: Simplify right side
   1,385.83x = 1,619,940.43
5. Step 5: Solve for x
   x = 1,619,940.43/1,385.83
6. Step 6: Final answer
   x = 1,168.94