Finding the Fourth Proportional to 37,680.28, 56,485.86 and 13,039

Step by Step Solution

1. Step 1: Write the proportion equation
   37,680.28 : 56,485.86 = 13,039 : x
2. Step 2: Convert to fraction form
   37,680.28/56,485.86 = 13,039/x
3. Step 3: Cross multiply
   37,680.28x = 56,485.86 × 13,039
4. Step 4: Simplify right side
   37,680.28x = 736,519,128.54
5. Step 5: Solve for x
   x = 736,519,128.54/37,680.28
6. Step 6: Final answer
   x = 19,546.54