Finding the Fourth Proportional to 9,881.98, 13,638.31 and 5,691.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,881.98 : 13,638.31 = 5,691.04 : x
2. Step 2: Convert to fraction form
   9,881.98/13,638.31 = 5,691.04/x
3. Step 3: Cross multiply
   9,881.98x = 13,638.31 × 5,691.04
4. Step 4: Simplify right side
   9,881.98x = 77,616,167.74
5. Step 5: Solve for x
   x = 77,616,167.74/9,881.98
6. Step 6: Final answer
   x = 7,854.31