Finding the Fourth Proportional to 19,339.50, 29,012.89 and 13,779.05

Step by Step Solution

1. Step 1: Write the proportion equation
   19,339.50 : 29,012.89 = 13,779.05 : x
2. Step 2: Convert to fraction form
   19,339.50/29,012.89 = 13,779.05/x
3. Step 3: Cross multiply
   19,339.50x = 29,012.89 × 13,779.05
4. Step 4: Simplify right side
   19,339.50x = 399,769,954.97
5. Step 5: Solve for x
   x = 399,769,954.97/19,339.50
6. Step 6: Final answer
   x = 20,671.17