Finding the Fourth Proportional to 1,059.03, 1,587.60 and 538.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.03 : 1,587.60 = 538.74 : x
2. Step 2: Convert to fraction form
   1,059.03/1,587.60 = 538.74/x
3. Step 3: Cross multiply
   1,059.03x = 1,587.60 × 538.74
4. Step 4: Simplify right side
   1,059.03x = 855,300.93
5. Step 5: Solve for x
   x = 855,300.93/1,059.03
6. Step 6: Final answer
   x = 807.63