Finding the Fourth Proportional to 11,870.78, 17,799.59 and 4,855.71

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.78 : 17,799.59 = 4,855.71 : x
2. Step 2: Convert to fraction form
   11,870.78/17,799.59 = 4,855.71/x
3. Step 3: Cross multiply
   11,870.78x = 17,799.59 × 4,855.71
4. Step 4: Simplify right side
   11,870.78x = 86,429,622.88
5. Step 5: Solve for x
   x = 86,429,622.88/11,870.78
6. Step 6: Final answer
   x = 7,280.87