Finding the Fourth Proportional to 1,639.69, 2,261.81 and 976.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,639.69 : 2,261.81 = 976.50 : x
2. Step 2: Convert to fraction form
   1,639.69/2,261.81 = 976.50/x
3. Step 3: Cross multiply
   1,639.69x = 2,261.81 × 976.50
4. Step 4: Simplify right side
   1,639.69x = 2,208,659.91
5. Step 5: Solve for x
   x = 2,208,659.91/1,639.69
6. Step 6: Final answer
   x = 1,347.00