Finding the Fourth Proportional to 49,561.56, 74,341.36 and 19,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   49,561.56 : 74,341.36 = 19,978.72 : x
2. Step 2: Convert to fraction form
   49,561.56/74,341.36 = 19,978.72/x
3. Step 3: Cross multiply
   49,561.56x = 74,341.36 × 19,978.72
4. Step 4: Simplify right side
   49,561.56x = 1,485,245,215.86
5. Step 5: Solve for x
   x = 1,485,245,215.86/49,561.56
6. Step 6: Final answer
   x = 29,967.68