Finding the Fourth Proportional to 42,806.08, 64,216.02 and 13,216.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,806.08 : 64,216.02 = 13,216.98 : x
2. Step 2: Convert to fraction form
   42,806.08/64,216.02 = 13,216.98/x
3. Step 3: Cross multiply
   42,806.08x = 64,216.02 × 13,216.98
4. Step 4: Simplify right side
   42,806.08x = 848,741,852.02
5. Step 5: Solve for x
   x = 848,741,852.02/42,806.08
6. Step 6: Final answer
   x = 19,827.60