Finding the Fourth Proportional to 1,279.02, 1,918.59 and 354.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.02 : 1,918.59 = 354.59 : x
2. Step 2: Convert to fraction form
   1,279.02/1,918.59 = 354.59/x
3. Step 3: Cross multiply
   1,279.02x = 1,918.59 × 354.59
4. Step 4: Simplify right side
   1,279.02x = 680,309.10
5. Step 5: Solve for x
   x = 680,309.10/1,279.02
6. Step 6: Final answer
   x = 531.90