Finding the Fourth Proportional to 1,404.38, 2,106.87 and 538.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.38 : 2,106.87 = 538.69 : x
2. Step 2: Convert to fraction form
   1,404.38/2,106.87 = 538.69/x
3. Step 3: Cross multiply
   1,404.38x = 2,106.87 × 538.69
4. Step 4: Simplify right side
   1,404.38x = 1,134,949.80
5. Step 5: Solve for x
   x = 1,134,949.80/1,404.38
6. Step 6: Final answer
   x = 808.15