Finding the Fourth Proportional to 1,003.71, 1,504.52 and 345.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.71 : 1,504.52 = 345.39 : x
2. Step 2: Convert to fraction form
   1,003.71/1,504.52 = 345.39/x
3. Step 3: Cross multiply
   1,003.71x = 1,504.52 × 345.39
4. Step 4: Simplify right side
   1,003.71x = 519,644.44
5. Step 5: Solve for x
   x = 519,644.44/1,003.71
6. Step 6: Final answer
   x = 517.72