Finding the Fourth Proportional to 12,091.80, 18,123.30 and 5,071.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,091.80 : 18,123.30 = 5,071.80 : x
2. Step 2: Convert to fraction form
   12,091.80/18,123.30 = 5,071.80/x
3. Step 3: Cross multiply
   12,091.80x = 18,123.30 × 5,071.80
4. Step 4: Simplify right side
   12,091.80x = 91,917,752.94
5. Step 5: Solve for x
   x = 91,917,752.94/12,091.80
6. Step 6: Final answer
   x = 7,601.66