Finding the Fourth Proportional to 13,091.72, 18,066.77 and 7,123.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.72 : 18,066.77 = 7,123.40 : x
2. Step 2: Convert to fraction form
   13,091.72/18,066.77 = 7,123.40/x
3. Step 3: Cross multiply
   13,091.72x = 18,066.77 × 7,123.40
4. Step 4: Simplify right side
   13,091.72x = 128,696,703.47
5. Step 5: Solve for x
   x = 128,696,703.47/13,091.72
6. Step 6: Final answer
   x = 9,830.39