Finding the Fourth Proportional to 1,010.55, 1,515.50 and 394.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.55 : 1,515.50 = 394.10 : x
2. Step 2: Convert to fraction form
   1,010.55/1,515.50 = 394.10/x
3. Step 3: Cross multiply
   1,010.55x = 1,515.50 × 394.10
4. Step 4: Simplify right side
   1,010.55x = 597,256.58
5. Step 5: Solve for x
   x = 597,256.58/1,010.55
6. Step 6: Final answer
   x = 591.02