Finding the Fourth Proportional to 21,003.93, 31,504.83 and 7,855.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.93 : 31,504.83 = 7,855.34 : x
2. Step 2: Convert to fraction form
   21,003.93/31,504.83 = 7,855.34/x
3. Step 3: Cross multiply
   21,003.93x = 31,504.83 × 7,855.34
4. Step 4: Simplify right side
   21,003.93x = 247,480,993.77
5. Step 5: Solve for x
   x = 247,480,993.77/21,003.93
6. Step 6: Final answer
   x = 11,782.60