Finding the Fourth Proportional to 43,013.83, 64,518.46 and 13,428.27

Step by Step Solution

1. Step 1: Write the proportion equation
   43,013.83 : 64,518.46 = 13,428.27 : x
2. Step 2: Convert to fraction form
   43,013.83/64,518.46 = 13,428.27/x
3. Step 3: Cross multiply
   43,013.83x = 64,518.46 × 13,428.27
4. Step 4: Simplify right side
   43,013.83x = 866,371,233.72
5. Step 5: Solve for x
   x = 866,371,233.72/43,013.83
6. Step 6: Final answer
   x = 20,141.69