Finding the Fourth Proportional to 13,439.55, 18,543.88 and 8,134.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,439.55 : 18,543.88 = 8,134.72 : x
2. Step 2: Convert to fraction form
   13,439.55/18,543.88 = 8,134.72/x
3. Step 3: Cross multiply
   13,439.55x = 18,543.88 × 8,134.72
4. Step 4: Simplify right side
   13,439.55x = 150,849,271.51
5. Step 5: Solve for x
   x = 150,849,271.51/13,439.55
6. Step 6: Final answer
   x = 11,224.28