Finding the Fourth Proportional to 30,642.72, 45,921.56 and 13,961.99

Step by Step Solution

1. Step 1: Write the proportion equation
   30,642.72 : 45,921.56 = 13,961.99 : x
2. Step 2: Convert to fraction form
   30,642.72/45,921.56 = 13,961.99/x
3. Step 3: Cross multiply
   30,642.72x = 45,921.56 × 13,961.99
4. Step 4: Simplify right side
   30,642.72x = 641,156,062.09
5. Step 5: Solve for x
   x = 641,156,062.09/30,642.72
6. Step 6: Final answer
   x = 20,923.60