Finding the Fourth Proportional to 13,091.45, 18,066.57 and 7,123.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.45 : 18,066.57 = 7,123.50 : x
2. Step 2: Convert to fraction form
   13,091.45/18,066.57 = 7,123.50/x
3. Step 3: Cross multiply
   13,091.45x = 18,066.57 × 7,123.50
4. Step 4: Simplify right side
   13,091.45x = 128,697,193.97
5. Step 5: Solve for x
   x = 128,697,193.97/13,091.45
6. Step 6: Final answer
   x = 9,830.63