Finding the Fourth Proportional to 42,796.29, 64,200.57 and 13,216.65

Step by Step Solution

1. Step 1: Write the proportion equation
   42,796.29 : 64,200.57 = 13,216.65 : x
2. Step 2: Convert to fraction form
   42,796.29/64,200.57 = 13,216.65/x
3. Step 3: Cross multiply
   42,796.29x = 64,200.57 × 13,216.65
4. Step 4: Simplify right side
   42,796.29x = 848,516,463.49
5. Step 5: Solve for x
   x = 848,516,463.49/42,796.29
6. Step 6: Final answer
   x = 19,826.87