Finding the Fourth Proportional to 11,878.72, 17,815.55 and 3,981.83

Step by Step Solution

1. Step 1: Write the proportion equation
   11,878.72 : 17,815.55 = 3,981.83 : x
2. Step 2: Convert to fraction form
   11,878.72/17,815.55 = 3,981.83/x
3. Step 3: Cross multiply
   11,878.72x = 17,815.55 × 3,981.83
4. Step 4: Simplify right side
   11,878.72x = 70,938,382.47
5. Step 5: Solve for x
   x = 70,938,382.47/11,878.72
6. Step 6: Final answer
   x = 5,971.89