Finding the Fourth Proportional to 11,802.41, 17,721.06 and 7,878.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,802.41 : 17,721.06 = 7,878.12 : x
2. Step 2: Convert to fraction form
   11,802.41/17,721.06 = 7,878.12/x
3. Step 3: Cross multiply
   11,802.41x = 17,721.06 × 7,878.12
4. Step 4: Simplify right side
   11,802.41x = 139,608,585.52
5. Step 5: Solve for x
   x = 139,608,585.52/11,802.41
6. Step 6: Final answer
   x = 11,828.82