Finding the Fourth Proportional to 34,978.72, 52,439 and 13,905.76

Step by Step Solution

1. Step 1: Write the proportion equation
   34,978.72 : 52,439 = 13,905.76 : x
2. Step 2: Convert to fraction form
   34,978.72/52,439 = 13,905.76/x
3. Step 3: Cross multiply
   34,978.72x = 52,439 × 13,905.76
4. Step 4: Simplify right side
   34,978.72x = 729,204,148.64
5. Step 5: Solve for x
   x = 729,204,148.64/34,978.72
6. Step 6: Final answer
   x = 20,847.08