Finding the Fourth Proportional to 14,085.92, 21,149.58 and 7,858.10

Step by Step Solution

1. Step 1: Write the proportion equation
   14,085.92 : 21,149.58 = 7,858.10 : x
2. Step 2: Convert to fraction form
   14,085.92/21,149.58 = 7,858.10/x
3. Step 3: Cross multiply
   14,085.92x = 21,149.58 × 7,858.10
4. Step 4: Simplify right side
   14,085.92x = 166,195,514.60
5. Step 5: Solve for x
   x = 166,195,514.60/14,085.92
6. Step 6: Final answer
   x = 11,798.70