Finding the Fourth Proportional to 1,031.15, 1,547.42 and 381.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.15 : 1,547.42 = 381.89 : x
2. Step 2: Convert to fraction form
   1,031.15/1,547.42 = 381.89/x
3. Step 3: Cross multiply
   1,031.15x = 1,547.42 × 381.89
4. Step 4: Simplify right side
   1,031.15x = 590,934.58
5. Step 5: Solve for x
   x = 590,934.58/1,031.15
6. Step 6: Final answer
   x = 573.09