Finding the Fourth Proportional to 34,399.81, 47,480.19 and 20,978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   34,399.81 : 47,480.19 = 20,978.47 : x
2. Step 2: Convert to fraction form
   34,399.81/47,480.19 = 20,978.47/x
3. Step 3: Cross multiply
   34,399.81x = 47,480.19 × 20,978.47
4. Step 4: Simplify right side
   34,399.81x = 996,061,741.51
5. Step 5: Solve for x
   x = 996,061,741.51/34,399.81
6. Step 6: Final answer
   x = 28,955.44