Finding the Fourth Proportional to 19,400.42, 29,075.78 and 12,377.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,400.42 : 29,075.78 = 12,377.72 : x
2. Step 2: Convert to fraction form
   19,400.42/29,075.78 = 12,377.72/x
3. Step 3: Cross multiply
   19,400.42x = 29,075.78 × 12,377.72
4. Step 4: Simplify right side
   19,400.42x = 359,891,863.62
5. Step 5: Solve for x
   x = 359,891,863.62/19,400.42
6. Step 6: Final answer
   x = 18,550.73