Finding the Fourth Proportional to 1,991.56, 3,009.91 and 1,969.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.56 : 3,009.91 = 1,969.68 : x
2. Step 2: Convert to fraction form
   1,991.56/3,009.91 = 1,969.68/x
3. Step 3: Cross multiply
   1,991.56x = 3,009.91 × 1,969.68
4. Step 4: Simplify right side
   1,991.56x = 5,928,559.53
5. Step 5: Solve for x
   x = 5,928,559.53/1,991.56
6. Step 6: Final answer
   x = 2,976.84