Finding the Fourth Proportional to 1,051.82, 1,576.72 and 393.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.82 : 1,576.72 = 393.51 : x
2. Step 2: Convert to fraction form
   1,051.82/1,576.72 = 393.51/x
3. Step 3: Cross multiply
   1,051.82x = 1,576.72 × 393.51
4. Step 4: Simplify right side
   1,051.82x = 620,460.75
5. Step 5: Solve for x
   x = 620,460.75/1,051.82
6. Step 6: Final answer
   x = 589.89