Finding the Fourth Proportional to 21,182.42, 31,763.76 and 7,854.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,182.42 : 31,763.76 = 7,854.87 : x
2. Step 2: Convert to fraction form
   21,182.42/31,763.76 = 7,854.87/x
3. Step 3: Cross multiply
   21,182.42x = 31,763.76 × 7,854.87
4. Step 4: Simplify right side
   21,182.42x = 249,500,205.51
5. Step 5: Solve for x
   x = 249,500,205.51/21,182.42
6. Step 6: Final answer
   x = 11,778.65