Finding the Fourth Proportional to 12,419.84, 18,601.04 and 7,478.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,419.84 : 18,601.04 = 7,478.60 : x
2. Step 2: Convert to fraction form
   12,419.84/18,601.04 = 7,478.60/x
3. Step 3: Cross multiply
   12,419.84x = 18,601.04 × 7,478.60
4. Step 4: Simplify right side
   12,419.84x = 139,109,607.35
5. Step 5: Solve for x
   x = 139,109,607.35/12,419.84
6. Step 6: Final answer
   x = 11,200.60