Finding the Fourth Proportional to 1,433.12, 1,978.24 and 1,316.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.12 : 1,978.24 = 1,316.48 : x
2. Step 2: Convert to fraction form
   1,433.12/1,978.24 = 1,316.48/x
3. Step 3: Cross multiply
   1,433.12x = 1,978.24 × 1,316.48
4. Step 4: Simplify right side
   1,433.12x = 2,604,313.40
5. Step 5: Solve for x
   x = 2,604,313.40/1,433.12
6. Step 6: Final answer
   x = 1,817.23