Finding the Fourth Proportional to 19,412.63, 29,118.72 and 13,690.04

Step by Step Solution

1. Step 1: Write the proportion equation
   19,412.63 : 29,118.72 = 13,690.04 : x
2. Step 2: Convert to fraction form
   19,412.63/29,118.72 = 13,690.04/x
3. Step 3: Cross multiply
   19,412.63x = 29,118.72 × 13,690.04
4. Step 4: Simplify right side
   19,412.63x = 398,636,441.55
5. Step 5: Solve for x
   x = 398,636,441.55/19,412.63
6. Step 6: Final answer
   x = 20,534.90