Finding the Fourth Proportional to 42,812.82, 64,196.15 and 13,222.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,812.82 : 64,196.15 = 13,222.71 : x
2. Step 2: Convert to fraction form
   42,812.82/64,196.15 = 13,222.71/x
3. Step 3: Cross multiply
   42,812.82x = 64,196.15 × 13,222.71
4. Step 4: Simplify right side
   42,812.82x = 848,847,008.45
5. Step 5: Solve for x
   x = 848,847,008.45/42,812.82
6. Step 6: Final answer
   x = 19,826.94