Finding the Fourth Proportional to 1,008.42, 1,511.69 and 392.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.42 : 1,511.69 = 392.52 : x
2. Step 2: Convert to fraction form
   1,008.42/1,511.69 = 392.52/x
3. Step 3: Cross multiply
   1,008.42x = 1,511.69 × 392.52
4. Step 4: Simplify right side
   1,008.42x = 593,366.60
5. Step 5: Solve for x
   x = 593,366.60/1,008.42
6. Step 6: Final answer
   x = 588.41