Finding the Fourth Proportional to 43,111.08, 64,639.89 and 18,138.33

Step by Step Solution

1. Step 1: Write the proportion equation
   43,111.08 : 64,639.89 = 18,138.33 : x
2. Step 2: Convert to fraction form
   43,111.08/64,639.89 = 18,138.33/x
3. Step 3: Cross multiply
   43,111.08x = 64,639.89 × 18,138.33
4. Step 4: Simplify right side
   43,111.08x = 1,172,459,655.98
5. Step 5: Solve for x
   x = 1,172,459,655.98/43,111.08
6. Step 6: Final answer
   x = 27,196.25