Finding the Fourth Proportional to 3,868.80, 5,802.72 and 1,271.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.80 : 5,802.72 = 1,271.76 : x
2. Step 2: Convert to fraction form
   3,868.80/5,802.72 = 1,271.76/x
3. Step 3: Cross multiply
   3,868.80x = 5,802.72 × 1,271.76
4. Step 4: Simplify right side
   3,868.80x = 7,379,667.19
5. Step 5: Solve for x
   x = 7,379,667.19/3,868.80
6. Step 6: Final answer
   x = 1,907.48