Finding the Fourth Proportional to 12,870.99, 19,307.34 and 5,085.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.99 : 19,307.34 = 5,085.27 : x
2. Step 2: Convert to fraction form
   12,870.99/19,307.34 = 5,085.27/x
3. Step 3: Cross multiply
   12,870.99x = 19,307.34 × 5,085.27
4. Step 4: Simplify right side
   12,870.99x = 98,183,036.88
5. Step 5: Solve for x
   x = 98,183,036.88/12,870.99
6. Step 6: Final answer
   x = 7,628.24