Finding the Fourth Proportional to 37,105.60, 55,663.80 and 12,139.60

Step by Step Solution

1. Step 1: Write the proportion equation
   37,105.60 : 55,663.80 = 12,139.60 : x
2. Step 2: Convert to fraction form
   37,105.60/55,663.80 = 12,139.60/x
3. Step 3: Cross multiply
   37,105.60x = 55,663.80 × 12,139.60
4. Step 4: Simplify right side
   37,105.60x = 675,736,266.48
5. Step 5: Solve for x
   x = 675,736,266.48/37,105.60
6. Step 6: Final answer
   x = 18,211.17