Finding the Fourth Proportional to 1,437.76, 1,984.12 and 816.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,437.76 : 1,984.12 = 816.72 : x
2. Step 2: Convert to fraction form
   1,437.76/1,984.12 = 816.72/x
3. Step 3: Cross multiply
   1,437.76x = 1,984.12 × 816.72
4. Step 4: Simplify right side
   1,437.76x = 1,620,470.49
5. Step 5: Solve for x
   x = 1,620,470.49/1,437.76
6. Step 6: Final answer
   x = 1,127.08