Finding the Fourth Proportional to 12,156.72, 18,203.52 and 10,412.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.72 : 18,203.52 = 10,412.91 : x
2. Step 2: Convert to fraction form
   12,156.72/18,203.52 = 10,412.91/x
3. Step 3: Cross multiply
   12,156.72x = 18,203.52 × 10,412.91
4. Step 4: Simplify right side
   12,156.72x = 189,551,615.44
5. Step 5: Solve for x
   x = 189,551,615.44/12,156.72
6. Step 6: Final answer
   x = 15,592.33