Finding the Fourth Proportional to 42,725.86, 64,088.94 and 13,143.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,725.86 : 64,088.94 = 13,143.49 : x
2. Step 2: Convert to fraction form
   42,725.86/64,088.94 = 13,143.49/x
3. Step 3: Cross multiply
   42,725.86x = 64,088.94 × 13,143.49
4. Step 4: Simplify right side
   42,725.86x = 842,352,231.07
5. Step 5: Solve for x
   x = 842,352,231.07/42,725.86
6. Step 6: Final answer
   x = 19,715.28