Finding the Fourth Proportional to 5,111.63, 7,667.94 and 1,991.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.63 : 7,667.94 = 1,991.89 : x
2. Step 2: Convert to fraction form
   5,111.63/7,667.94 = 1,991.89/x
3. Step 3: Cross multiply
   5,111.63x = 7,667.94 × 1,991.89
4. Step 4: Simplify right side
   5,111.63x = 15,273,693.01
5. Step 5: Solve for x
   x = 15,273,693.01/5,111.63
6. Step 6: Final answer
   x = 2,988.03