Finding the Fourth Proportional to 13,435.57, 18,542.01 and 7,771.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,435.57 : 18,542.01 = 7,771.34 : x
2. Step 2: Convert to fraction form
   13,435.57/18,542.01 = 7,771.34/x
3. Step 3: Cross multiply
   13,435.57x = 18,542.01 × 7,771.34
4. Step 4: Simplify right side
   13,435.57x = 144,096,339.49
5. Step 5: Solve for x
   x = 144,096,339.49/13,435.57
6. Step 6: Final answer
   x = 10,724.99