Finding the Fourth Proportional to 1,384.51, 1,910.94 and 825.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.51 : 1,910.94 = 825.28 : x
2. Step 2: Convert to fraction form
   1,384.51/1,910.94 = 825.28/x
3. Step 3: Cross multiply
   1,384.51x = 1,910.94 × 825.28
4. Step 4: Simplify right side
   1,384.51x = 1,577,060.56
5. Step 5: Solve for x
   x = 1,577,060.56/1,384.51
6. Step 6: Final answer
   x = 1,139.07