Finding the Fourth Proportional to 43,013.82, 64,518.42 and 13,428.24

Step by Step Solution

1. Step 1: Write the proportion equation
   43,013.82 : 64,518.42 = 13,428.24 : x
2. Step 2: Convert to fraction form
   43,013.82/64,518.42 = 13,428.24/x
3. Step 3: Cross multiply
   43,013.82x = 64,518.42 × 13,428.24
4. Step 4: Simplify right side
   43,013.82x = 866,368,828.18
5. Step 5: Solve for x
   x = 866,368,828.18/43,013.82
6. Step 6: Final answer
   x = 20,141.64