Finding the Fourth Proportional to 15,442.08, 21,290.16 and 12,606.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,442.08 : 21,290.16 = 12,606.72 : x
2. Step 2: Convert to fraction form
   15,442.08/21,290.16 = 12,606.72/x
3. Step 3: Cross multiply
   15,442.08x = 21,290.16 × 12,606.72
4. Step 4: Simplify right side
   15,442.08x = 268,399,085.88
5. Step 5: Solve for x
   x = 268,399,085.88/15,442.08
6. Step 6: Final answer
   x = 17,381.02