Finding the Fourth Proportional to 13,698.42, 18,903.81 and 7,410.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,698.42 : 18,903.81 = 7,410.78 : x
2. Step 2: Convert to fraction form
   13,698.42/18,903.81 = 7,410.78/x
3. Step 3: Cross multiply
   13,698.42x = 18,903.81 × 7,410.78
4. Step 4: Simplify right side
   13,698.42x = 140,091,977.07
5. Step 5: Solve for x
   x = 140,091,977.07/13,698.42
6. Step 6: Final answer
   x = 10,226.87