Finding the Fourth Proportional to 10,911.60, 16,365.42 and 3,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,911.60 : 16,365.42 = 3,118.50 : x
2. Step 2: Convert to fraction form
   10,911.60/16,365.42 = 3,118.50/x
3. Step 3: Cross multiply
   10,911.60x = 16,365.42 × 3,118.50
4. Step 4: Simplify right side
   10,911.60x = 51,035,562.27
5. Step 5: Solve for x
   x = 51,035,562.27/10,911.60
6. Step 6: Final answer
   x = 4,677.18