Finding the Fourth Proportional to 12,893.91, 17,793.57 and 7,858.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,893.91 : 17,793.57 = 7,858.15 : x
2. Step 2: Convert to fraction form
   12,893.91/17,793.57 = 7,858.15/x
3. Step 3: Cross multiply
   12,893.91x = 17,793.57 × 7,858.15
4. Step 4: Simplify right side
   12,893.91x = 139,824,542.10
5. Step 5: Solve for x
   x = 139,824,542.10/12,893.91
6. Step 6: Final answer
   x = 10,844.23