Finding the Fourth Proportional to 13,772.31, 20,659.83 and 4,409.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,772.31 : 20,659.83 = 4,409.98 : x
2. Step 2: Convert to fraction form
   13,772.31/20,659.83 = 4,409.98/x
3. Step 3: Cross multiply
   13,772.31x = 20,659.83 × 4,409.98
4. Step 4: Simplify right side
   13,772.31x = 91,109,437.10
5. Step 5: Solve for x
   x = 91,109,437.10/13,772.31
6. Step 6: Final answer
   x = 6,615.41