Finding the Fourth Proportional to 43,308.56, 64,964.76 and 12,143.12

Step by Step Solution

1. Step 1: Write the proportion equation
   43,308.56 : 64,964.76 = 12,143.12 : x
2. Step 2: Convert to fraction form
   43,308.56/64,964.76 = 12,143.12/x
3. Step 3: Cross multiply
   43,308.56x = 64,964.76 × 12,143.12
4. Step 4: Simplify right side
   43,308.56x = 788,874,876.45
5. Step 5: Solve for x
   x = 788,874,876.45/43,308.56
6. Step 6: Final answer
   x = 18,215.22