Finding the Fourth Proportional to 37,405.96, 56,096.76 and 12,439.30

Step by Step Solution

1. Step 1: Write the proportion equation
   37,405.96 : 56,096.76 = 12,439.30 : x
2. Step 2: Convert to fraction form
   37,405.96/56,096.76 = 12,439.30/x
3. Step 3: Cross multiply
   37,405.96x = 56,096.76 × 12,439.30
4. Step 4: Simplify right side
   37,405.96x = 697,804,426.67
5. Step 5: Solve for x
   x = 697,804,426.67/37,405.96
6. Step 6: Final answer
   x = 18,654.90