Finding the Fourth Proportional to 1,326.34, 1,989.76 and 401.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,326.34 : 1,989.76 = 401.98 : x
2. Step 2: Convert to fraction form
   1,326.34/1,989.76 = 401.98/x
3. Step 3: Cross multiply
   1,326.34x = 1,989.76 × 401.98
4. Step 4: Simplify right side
   1,326.34x = 799,843.72
5. Step 5: Solve for x
   x = 799,843.72/1,326.34
6. Step 6: Final answer
   x = 603.05