Finding the Fourth Proportional to 13,699.31, 20,551.32 and 4,339.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,699.31 : 20,551.32 = 4,339.18 : x
2. Step 2: Convert to fraction form
   13,699.31/20,551.32 = 4,339.18/x
3. Step 3: Cross multiply
   13,699.31x = 20,551.32 × 4,339.18
4. Step 4: Simplify right side
   13,699.31x = 89,175,876.72
5. Step 5: Solve for x
   x = 89,175,876.72/13,699.31
6. Step 6: Final answer
   x = 6,509.52