Finding the Fourth Proportional to 1,399.48, 2,100.06 and 522.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.48 : 2,100.06 = 522.16 : x
2. Step 2: Convert to fraction form
   1,399.48/2,100.06 = 522.16/x
3. Step 3: Cross multiply
   1,399.48x = 2,100.06 × 522.16
4. Step 4: Simplify right side
   1,399.48x = 1,096,567.33
5. Step 5: Solve for x
   x = 1,096,567.33/1,399.48
6. Step 6: Final answer
   x = 783.55