Finding the Fourth Proportional to 13,091.68, 18,066.71 and 7,123.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.68 : 18,066.71 = 7,123.36 : x
2. Step 2: Convert to fraction form
   13,091.68/18,066.71 = 7,123.36/x
3. Step 3: Cross multiply
   13,091.68x = 18,066.71 × 7,123.36
4. Step 4: Simplify right side
   13,091.68x = 128,695,679.35
5. Step 5: Solve for x
   x = 128,695,679.35/13,091.68
6. Step 6: Final answer
   x = 9,830.34