Finding the Fourth Proportional to 36,100.72, 54,139.56 and 12,402.55

Step by Step Solution

1. Step 1: Write the proportion equation
   36,100.72 : 54,139.56 = 12,402.55 : x
2. Step 2: Convert to fraction form
   36,100.72/54,139.56 = 12,402.55/x
3. Step 3: Cross multiply
   36,100.72x = 54,139.56 × 12,402.55
4. Step 4: Simplify right side
   36,100.72x = 671,468,673.37
5. Step 5: Solve for x
   x = 671,468,673.37/36,100.72
6. Step 6: Final answer
   x = 18,599.87