Finding the Fourth Proportional to 1,325.34, 1,987.86 and 338.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,325.34 : 1,987.86 = 338.15 : x
2. Step 2: Convert to fraction form
   1,325.34/1,987.86 = 338.15/x
3. Step 3: Cross multiply
   1,325.34x = 1,987.86 × 338.15
4. Step 4: Simplify right side
   1,325.34x = 672,194.86
5. Step 5: Solve for x
   x = 672,194.86/1,325.34
6. Step 6: Final answer
   x = 507.19