Finding the Fourth Proportional to 21,087.84, 31,635.16 and 7,941.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.84 : 31,635.16 = 7,941.18 : x
2. Step 2: Convert to fraction form
   21,087.84/31,635.16 = 7,941.18/x
3. Step 3: Cross multiply
   21,087.84x = 31,635.16 × 7,941.18
4. Step 4: Simplify right side
   21,087.84x = 251,220,499.89
5. Step 5: Solve for x
   x = 251,220,499.89/21,087.84
6. Step 6: Final answer
   x = 11,913.05