Finding the Fourth Proportional to 21,046.24, 31,560.72 and 7,891.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,046.24 : 31,560.72 = 7,891.84 : x
2. Step 2: Convert to fraction form
   21,046.24/31,560.72 = 7,891.84/x
3. Step 3: Cross multiply
   21,046.24x = 31,560.72 × 7,891.84
4. Step 4: Simplify right side
   21,046.24x = 249,072,152.52
5. Step 5: Solve for x
   x = 249,072,152.52/21,046.24
6. Step 6: Final answer
   x = 11,834.52