Finding the Fourth Proportional to 5,111.81, 7,055.06 and 3,123.51

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.81 : 7,055.06 = 3,123.51 : x
2. Step 2: Convert to fraction form
   5,111.81/7,055.06 = 3,123.51/x
3. Step 3: Cross multiply
   5,111.81x = 7,055.06 × 3,123.51
4. Step 4: Simplify right side
   5,111.81x = 22,036,534.84
5. Step 5: Solve for x
   x = 22,036,534.84/5,111.81
6. Step 6: Final answer
   x = 4,310.91