Finding the Fourth Proportional to 13,091.70, 18,066.37 and 7,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.70 : 18,066.37 = 7,123.30 : x
2. Step 2: Convert to fraction form
   13,091.70/18,066.37 = 7,123.30/x
3. Step 3: Cross multiply
   13,091.70x = 18,066.37 × 7,123.30
4. Step 4: Simplify right side
   13,091.70x = 128,692,173.42
5. Step 5: Solve for x
   x = 128,692,173.42/13,091.70
6. Step 6: Final answer
   x = 9,830.06