Finding the Fourth Proportional to 1,636.32, 2,454.72 and 769.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.32 : 2,454.72 = 769.92 : x
2. Step 2: Convert to fraction form
   1,636.32/2,454.72 = 769.92/x
3. Step 3: Cross multiply
   1,636.32x = 2,454.72 × 769.92
4. Step 4: Simplify right side
   1,636.32x = 1,889,938.02
5. Step 5: Solve for x
   x = 1,889,938.02/1,636.32
6. Step 6: Final answer
   x = 1,154.99