Finding the Fourth Proportional to 42,715.89, 64,062.75 and 12,723.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,715.89 : 64,062.75 = 12,723.12 : x
2. Step 2: Convert to fraction form
   42,715.89/64,062.75 = 12,723.12/x
3. Step 3: Cross multiply
   42,715.89x = 64,062.75 × 12,723.12
4. Step 4: Simplify right side
   42,715.89x = 815,078,055.78
5. Step 5: Solve for x
   x = 815,078,055.78/42,715.89
6. Step 6: Final answer
   x = 19,081.38