Finding the Fourth Proportional to 1,328.59, 1,992.91 and 354.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.59 : 1,992.91 = 354.72 : x
2. Step 2: Convert to fraction form
   1,328.59/1,992.91 = 354.72/x
3. Step 3: Cross multiply
   1,328.59x = 1,992.91 × 354.72
4. Step 4: Simplify right side
   1,328.59x = 706,925.04
5. Step 5: Solve for x
   x = 706,925.04/1,328.59
6. Step 6: Final answer
   x = 532.09