Finding the Fourth Proportional to 10,955.15, 16,420.88 and 4,374.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,955.15 : 16,420.88 = 4,374.10 : x
2. Step 2: Convert to fraction form
   10,955.15/16,420.88 = 4,374.10/x
3. Step 3: Cross multiply
   10,955.15x = 16,420.88 × 4,374.10
4. Step 4: Simplify right side
   10,955.15x = 71,826,549.34
5. Step 5: Solve for x
   x = 71,826,549.34/10,955.15
6. Step 6: Final answer
   x = 6,556.42