Finding the Fourth Proportional to 42,723.72, 64,099.29 and 20,538.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,723.72 : 64,099.29 = 20,538.72 : x
2. Step 2: Convert to fraction form
   42,723.72/64,099.29 = 20,538.72/x
3. Step 3: Cross multiply
   42,723.72x = 64,099.29 × 20,538.72
4. Step 4: Simplify right side
   42,723.72x = 1,316,517,369.51
5. Step 5: Solve for x
   x = 1,316,517,369.51/42,723.72
6. Step 6: Final answer
   x = 30,814.67