Finding the Fourth Proportional to 21,426.36, 29,558.56 and 13,875.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,426.36 : 29,558.56 = 13,875.12 : x
2. Step 2: Convert to fraction form
   21,426.36/29,558.56 = 13,875.12/x
3. Step 3: Cross multiply
   21,426.36x = 29,558.56 × 13,875.12
4. Step 4: Simplify right side
   21,426.36x = 410,128,621.98
5. Step 5: Solve for x
   x = 410,128,621.98/21,426.36
6. Step 6: Final answer
   x = 19,141.31