Finding the Fourth Proportional to 1,388.52, 2,081.56 and 522.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.52 : 2,081.56 = 522.22 : x
2. Step 2: Convert to fraction form
   1,388.52/2,081.56 = 522.22/x
3. Step 3: Cross multiply
   1,388.52x = 2,081.56 × 522.22
4. Step 4: Simplify right side
   1,388.52x = 1,087,029.65
5. Step 5: Solve for x
   x = 1,087,029.65/1,388.52
6. Step 6: Final answer
   x = 782.87