Finding the Fourth Proportional to 1,421.72, 1,961.99 and 832.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.72 : 1,961.99 = 832.31 : x
2. Step 2: Convert to fraction form
   1,421.72/1,961.99 = 832.31/x
3. Step 3: Cross multiply
   1,421.72x = 1,961.99 × 832.31
4. Step 4: Simplify right side
   1,421.72x = 1,632,980.40
5. Step 5: Solve for x
   x = 1,632,980.40/1,421.72
6. Step 6: Final answer
   x = 1,148.60