Finding the Fourth Proportional to 13,436.59, 18,542.88 and 7,770.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,436.59 : 18,542.88 = 7,770.79 : x
2. Step 2: Convert to fraction form
   13,436.59/18,542.88 = 7,770.79/x
3. Step 3: Cross multiply
   13,436.59x = 18,542.88 × 7,770.79
4. Step 4: Simplify right side
   13,436.59x = 144,092,826.48
5. Step 5: Solve for x
   x = 144,092,826.48/13,436.59
6. Step 6: Final answer
   x = 10,723.91