Finding the Fourth Proportional to 19,916.72, 27,432.72 and 15,308.69

Step by Step Solution

1. Step 1: Write the proportion equation
   19,916.72 : 27,432.72 = 15,308.69 : x
2. Step 2: Convert to fraction form
   19,916.72/27,432.72 = 15,308.69/x
3. Step 3: Cross multiply
   19,916.72x = 27,432.72 × 15,308.69
4. Step 4: Simplify right side
   19,916.72x = 419,959,006.34
5. Step 5: Solve for x
   x = 419,959,006.34/19,916.72
6. Step 6: Final answer
   x = 21,085.75