Finding the Fourth Proportional to 3,886.04, 5,825.34 and 1,287.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.04 : 5,825.34 = 1,287.56 : x
2. Step 2: Convert to fraction form
   3,886.04/5,825.34 = 1,287.56/x
3. Step 3: Cross multiply
   3,886.04x = 5,825.34 × 1,287.56
4. Step 4: Simplify right side
   3,886.04x = 7,500,474.77
5. Step 5: Solve for x
   x = 7,500,474.77/3,886.04
6. Step 6: Final answer
   x = 1,930.11