Finding the Fourth Proportional to 13,091.81, 18,066.15 and 7,123.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.81 : 18,066.15 = 7,123.47 : x
2. Step 2: Convert to fraction form
   13,091.81/18,066.15 = 7,123.47/x
3. Step 3: Cross multiply
   13,091.81x = 18,066.15 × 7,123.47
4. Step 4: Simplify right side
   13,091.81x = 128,693,677.54
5. Step 5: Solve for x
   x = 128,693,677.54/13,091.81
6. Step 6: Final answer
   x = 9,830.09