Finding the Fourth Proportional to 43,273.78, 64,920.06 and 13,288.12

Step by Step Solution

1. Step 1: Write the proportion equation
   43,273.78 : 64,920.06 = 13,288.12 : x
2. Step 2: Convert to fraction form
   43,273.78/64,920.06 = 13,288.12/x
3. Step 3: Cross multiply
   43,273.78x = 64,920.06 × 13,288.12
4. Step 4: Simplify right side
   43,273.78x = 862,665,547.69
5. Step 5: Solve for x
   x = 862,665,547.69/43,273.78
6. Step 6: Final answer
   x = 19,935.06