Finding the Fourth Proportional to 21,055.02, 31,585.98 and 7,908.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,055.02 : 31,585.98 = 7,908.42 : x
2. Step 2: Convert to fraction form
   21,055.02/31,585.98 = 7,908.42/x
3. Step 3: Cross multiply
   21,055.02x = 31,585.98 × 7,908.42
4. Step 4: Simplify right side
   21,055.02x = 249,795,195.95
5. Step 5: Solve for x
   x = 249,795,195.95/21,055.02
6. Step 6: Final answer
   x = 11,863.93