Finding the Fourth Proportional to 12,123.60, 18,187.85 and 3,803.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.60 : 18,187.85 = 3,803.28 : x
2. Step 2: Convert to fraction form
   12,123.60/18,187.85 = 3,803.28/x
3. Step 3: Cross multiply
   12,123.60x = 18,187.85 × 3,803.28
4. Step 4: Simplify right side
   12,123.60x = 69,173,486.15
5. Step 5: Solve for x
   x = 69,173,486.15/12,123.60
6. Step 6: Final answer
   x = 5,705.69