Finding the Fourth Proportional to 9,888.81, 13,642.72 and 6,105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,888.81 : 13,642.72 = 6,105.40 : x
2. Step 2: Convert to fraction form
   9,888.81/13,642.72 = 6,105.40/x
3. Step 3: Cross multiply
   9,888.81x = 13,642.72 × 6,105.40
4. Step 4: Simplify right side
   9,888.81x = 83,294,262.69
5. Step 5: Solve for x
   x = 83,294,262.69/9,888.81
6. Step 6: Final answer
   x = 8,423.08