Finding the Fourth Proportional to 43,128.42, 64,708.38 and 18,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   43,128.42 : 64,708.38 = 18,174.72 : x
2. Step 2: Convert to fraction form
   43,128.42/64,708.38 = 18,174.72/x
3. Step 3: Cross multiply
   43,128.42x = 64,708.38 × 18,174.72
4. Step 4: Simplify right side
   43,128.42x = 1,176,056,688.15
5. Step 5: Solve for x
   x = 1,176,056,688.15/43,128.42
6. Step 6: Final answer
   x = 27,268.72