Finding the Fourth Proportional to 21,058.94, 31,588.28 and 5,263.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,058.94 : 31,588.28 = 5,263.89 : x
2. Step 2: Convert to fraction form
   21,058.94/31,588.28 = 5,263.89/x
3. Step 3: Cross multiply
   21,058.94x = 31,588.28 × 5,263.89
4. Step 4: Simplify right side
   21,058.94x = 166,277,204.89
5. Step 5: Solve for x
   x = 166,277,204.89/21,058.94
6. Step 6: Final answer
   x = 7,895.80