Finding the Fourth Proportional to 19,685.41, 29,488.77 and 13,429.89

Step by Step Solution

1. Step 1: Write the proportion equation
   19,685.41 : 29,488.77 = 13,429.89 : x
2. Step 2: Convert to fraction form
   19,685.41/29,488.77 = 13,429.89/x
3. Step 3: Cross multiply
   19,685.41x = 29,488.77 × 13,429.89
4. Step 4: Simplify right side
   19,685.41x = 396,030,937.34
5. Step 5: Solve for x
   x = 396,030,937.34/19,685.41
6. Step 6: Final answer
   x = 20,118.00