Finding the Fourth Proportional to 15,580.49, 21,488.94 and 13,789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   15,580.49 : 21,488.94 = 13,789.89 : x
2. Step 2: Convert to fraction form
   15,580.49/21,488.94 = 13,789.89/x
3. Step 3: Cross multiply
   15,580.49x = 21,488.94 × 13,789.89
4. Step 4: Simplify right side
   15,580.49x = 296,330,118.82
5. Step 5: Solve for x
   x = 296,330,118.82/15,580.49
6. Step 6: Final answer
   x = 19,019.31