Finding the Fourth Proportional to 12,891.78, 19,335.34 and 5,870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,891.78 : 19,335.34 = 5,870.12 : x
2. Step 2: Convert to fraction form
   12,891.78/19,335.34 = 5,870.12/x
3. Step 3: Cross multiply
   12,891.78x = 19,335.34 × 5,870.12
4. Step 4: Simplify right side
   12,891.78x = 113,500,766.04
5. Step 5: Solve for x
   x = 113,500,766.04/12,891.78
6. Step 6: Final answer
   x = 8,804.12