Finding the Fourth Proportional to 42,808.98, 64,216.28 and 11,219.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,808.98 : 64,216.28 = 11,219.82 : x
2. Step 2: Convert to fraction form
   42,808.98/64,216.28 = 11,219.82/x
3. Step 3: Cross multiply
   42,808.98x = 64,216.28 × 11,219.82
4. Step 4: Simplify right side
   42,808.98x = 720,494,889.91
5. Step 5: Solve for x
   x = 720,494,889.91/42,808.98
6. Step 6: Final answer
   x = 16,830.46