Finding the Fourth Proportional to 13,758.06, 18,986.54 and 7,789.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,758.06 : 18,986.54 = 7,789.58 : x
2. Step 2: Convert to fraction form
   13,758.06/18,986.54 = 7,789.58/x
3. Step 3: Cross multiply
   13,758.06x = 18,986.54 × 7,789.58
4. Step 4: Simplify right side
   13,758.06x = 147,897,038.37
5. Step 5: Solve for x
   x = 147,897,038.37/13,758.06
6. Step 6: Final answer
   x = 10,749.85