Finding the Fourth Proportional to 1,085.42, 1,627.86 and 354.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.42 : 1,627.86 = 354.98 : x
2. Step 2: Convert to fraction form
   1,085.42/1,627.86 = 354.98/x
3. Step 3: Cross multiply
   1,085.42x = 1,627.86 × 354.98
4. Step 4: Simplify right side
   1,085.42x = 577,857.74
5. Step 5: Solve for x
   x = 577,857.74/1,085.42
6. Step 6: Final answer
   x = 532.38