Finding the Fourth Proportional to 21,488.86, 29,644.86 and 13,937.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.86 : 29,644.86 = 13,937.10 : x
2. Step 2: Convert to fraction form
   21,488.86/29,644.86 = 13,937.10/x
3. Step 3: Cross multiply
   21,488.86x = 29,644.86 × 13,937.10
4. Step 4: Simplify right side
   21,488.86x = 413,163,378.31
5. Step 5: Solve for x
   x = 413,163,378.31/21,488.86
6. Step 6: Final answer
   x = 19,226.86