Finding the Fourth Proportional to 3,885.89, 5,827.57 and 1,288.13

Step by Step Solution

1. Step 1: Write the proportion equation
   3,885.89 : 5,827.57 = 1,288.13 : x
2. Step 2: Convert to fraction form
   3,885.89/5,827.57 = 1,288.13/x
3. Step 3: Cross multiply
   3,885.89x = 5,827.57 × 1,288.13
4. Step 4: Simplify right side
   3,885.89x = 7,506,635.39
5. Step 5: Solve for x
   x = 7,506,635.39/3,885.89
6. Step 6: Final answer
   x = 1,931.77