Finding the Fourth Proportional to 3,179.47, 4,769.72 and 987.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,179.47 : 4,769.72 = 987.69 : x
2. Step 2: Convert to fraction form
   3,179.47/4,769.72 = 987.69/x
3. Step 3: Cross multiply
   3,179.47x = 4,769.72 × 987.69
4. Step 4: Simplify right side
   3,179.47x = 4,710,975.96
5. Step 5: Solve for x
   x = 4,710,975.96/3,179.47
6. Step 6: Final answer
   x = 1,481.69