Finding the Fourth Proportional to 42,799.46, 64,198.71 and 13,213.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,799.46 : 64,198.71 = 13,213.94 : x
2. Step 2: Convert to fraction form
   42,799.46/64,198.71 = 13,213.94/x
3. Step 3: Cross multiply
   42,799.46x = 64,198.71 × 13,213.94
4. Step 4: Simplify right side
   42,799.46x = 848,317,581.02
5. Step 5: Solve for x
   x = 848,317,581.02/42,799.46
6. Step 6: Final answer
   x = 19,820.76