Finding the Fourth Proportional to 1,421.68, 1,960.32 and 1,071.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.68 : 1,960.32 = 1,071.76 : x
2. Step 2: Convert to fraction form
   1,421.68/1,960.32 = 1,071.76/x
3. Step 3: Cross multiply
   1,421.68x = 1,960.32 × 1,071.76
4. Step 4: Simplify right side
   1,421.68x = 2,100,992.56
5. Step 5: Solve for x
   x = 2,100,992.56/1,421.68
6. Step 6: Final answer
   x = 1,477.82