Finding the Fourth Proportional to 13,658.37, 18,848.25 and 7,690.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,658.37 : 18,848.25 = 7,690.70 : x
2. Step 2: Convert to fraction form
   13,658.37/18,848.25 = 7,690.70/x
3. Step 3: Cross multiply
   13,658.37x = 18,848.25 × 7,690.70
4. Step 4: Simplify right side
   13,658.37x = 144,956,142.03
5. Step 5: Solve for x
   x = 144,956,142.03/13,658.37
6. Step 6: Final answer
   x = 10,612.99