Finding the Fourth Proportional to 13,091.51, 18,065.75 and 7,123.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.51 : 18,065.75 = 7,123.17 : x
2. Step 2: Convert to fraction form
   13,091.51/18,065.75 = 7,123.17/x
3. Step 3: Cross multiply
   13,091.51x = 18,065.75 × 7,123.17
4. Step 4: Simplify right side
   13,091.51x = 128,685,372.81
5. Step 5: Solve for x
   x = 128,685,372.81/13,091.51
6. Step 6: Final answer
   x = 9,829.69