Finding the Fourth Proportional to 21,087.86, 31,621.04 and 7,042.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.86 : 31,621.04 = 7,042.83 : x
2. Step 2: Convert to fraction form
   21,087.86/31,621.04 = 7,042.83/x
3. Step 3: Cross multiply
   21,087.86x = 31,621.04 × 7,042.83
4. Step 4: Simplify right side
   21,087.86x = 222,701,573.93
5. Step 5: Solve for x
   x = 222,701,573.93/21,087.86
6. Step 6: Final answer
   x = 10,560.66