Finding the Fourth Proportional to 1,128.63, 1,693.22 and 359.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.63 : 1,693.22 = 359.13 : x
2. Step 2: Convert to fraction form
   1,128.63/1,693.22 = 359.13/x
3. Step 3: Cross multiply
   1,128.63x = 1,693.22 × 359.13
4. Step 4: Simplify right side
   1,128.63x = 608,086.10
5. Step 5: Solve for x
   x = 608,086.10/1,128.63
6. Step 6: Final answer
   x = 538.78