Finding the Fourth Proportional to 13,778.94, 19,012.59 and 7,809.39

Step by Step Solution

1. Step 1: Write the proportion equation
   13,778.94 : 19,012.59 = 7,809.39 : x
2. Step 2: Convert to fraction form
   13,778.94/19,012.59 = 7,809.39/x
3. Step 3: Cross multiply
   13,778.94x = 19,012.59 × 7,809.39
4. Step 4: Simplify right side
   13,778.94x = 148,476,730.22
5. Step 5: Solve for x
   x = 148,476,730.22/13,778.94
6. Step 6: Final answer
   x = 10,775.63