Finding the Fourth Proportional to 1,269.59, 1,903.62 and 538.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,269.59 : 1,903.62 = 538.79 : x
2. Step 2: Convert to fraction form
   1,269.59/1,903.62 = 538.79/x
3. Step 3: Cross multiply
   1,269.59x = 1,903.62 × 538.79
4. Step 4: Simplify right side
   1,269.59x = 1,025,651.42
5. Step 5: Solve for x
   x = 1,025,651.42/1,269.59
6. Step 6: Final answer
   x = 807.86