Finding the Fourth Proportional to 13,091.72, 18,066.95 and 7,123.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.72 : 18,066.95 = 7,123.77 : x
2. Step 2: Convert to fraction form
   13,091.72/18,066.95 = 7,123.77/x
3. Step 3: Cross multiply
   13,091.72x = 18,066.95 × 7,123.77
4. Step 4: Simplify right side
   13,091.72x = 128,704,796.40
5. Step 5: Solve for x
   x = 128,704,796.40/13,091.72
6. Step 6: Final answer
   x = 9,831.01