Finding the Fourth Proportional to 21,662.57, 29,881.87 and 13,042.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,662.57 : 29,881.87 = 13,042.76 : x
2. Step 2: Convert to fraction form
   21,662.57/29,881.87 = 13,042.76/x
3. Step 3: Cross multiply
   21,662.57x = 29,881.87 × 13,042.76
4. Step 4: Simplify right side
   21,662.57x = 389,742,058.76
5. Step 5: Solve for x
   x = 389,742,058.76/21,662.57
6. Step 6: Final answer
   x = 17,991.50