Finding the Fourth Proportional to 1,431.30, 1,973.58 and 989.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.30 : 1,973.58 = 989.52 : x
2. Step 2: Convert to fraction form
   1,431.30/1,973.58 = 989.52/x
3. Step 3: Cross multiply
   1,431.30x = 1,973.58 × 989.52
4. Step 4: Simplify right side
   1,431.30x = 1,952,896.88
5. Step 5: Solve for x
   x = 1,952,896.88/1,431.30
6. Step 6: Final answer
   x = 1,364.42