Finding the Fourth Proportional to 1,128.74, 1,684.76 and 1,059.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.74 : 1,684.76 = 1,059.48 : x
2. Step 2: Convert to fraction form
   1,128.74/1,684.76 = 1,059.48/x
3. Step 3: Cross multiply
   1,128.74x = 1,684.76 × 1,059.48
4. Step 4: Simplify right side
   1,128.74x = 1,784,964.23
5. Step 5: Solve for x
   x = 1,784,964.23/1,128.74
6. Step 6: Final answer
   x = 1,581.38