Finding the Fourth Proportional to 21,005.16, 31,488.27 and 7,847.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,005.16 : 31,488.27 = 7,847.52 : x
2. Step 2: Convert to fraction form
   21,005.16/31,488.27 = 7,847.52/x
3. Step 3: Cross multiply
   21,005.16x = 31,488.27 × 7,847.52
4. Step 4: Simplify right side
   21,005.16x = 247,104,828.59
5. Step 5: Solve for x
   x = 247,104,828.59/21,005.16
6. Step 6: Final answer
   x = 11,764.01