Finding the Fourth Proportional to 1,321.53, 1,980.90 and 958.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.53 : 1,980.90 = 958.02 : x
2. Step 2: Convert to fraction form
   1,321.53/1,980.90 = 958.02/x
3. Step 3: Cross multiply
   1,321.53x = 1,980.90 × 958.02
4. Step 4: Simplify right side
   1,321.53x = 1,897,741.82
5. Step 5: Solve for x
   x = 1,897,741.82/1,321.53
6. Step 6: Final answer
   x = 1,436.02