Finding the Fourth Proportional to 13,091.40, 18,066.30 and 7,123.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.40 : 18,066.30 = 7,123.23 : x
2. Step 2: Convert to fraction form
   13,091.40/18,066.30 = 7,123.23/x
3. Step 3: Cross multiply
   13,091.40x = 18,066.30 × 7,123.23
4. Step 4: Simplify right side
   13,091.40x = 128,690,410.15
5. Step 5: Solve for x
   x = 128,690,410.15/13,091.40
6. Step 6: Final answer
   x = 9,830.15