Finding the Fourth Proportional to 1,399.08, 2,099.94 and 522.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.08 : 2,099.94 = 522.42 : x
2. Step 2: Convert to fraction form
   1,399.08/2,099.94 = 522.42/x
3. Step 3: Cross multiply
   1,399.08x = 2,099.94 × 522.42
4. Step 4: Simplify right side
   1,399.08x = 1,097,050.65
5. Step 5: Solve for x
   x = 1,097,050.65/1,399.08
6. Step 6: Final answer
   x = 784.12