Finding the Fourth Proportional to 13,737.89, 18,958.16 and 7,770.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,737.89 : 18,958.16 = 7,770.72 : x
2. Step 2: Convert to fraction form
   13,737.89/18,958.16 = 7,770.72/x
3. Step 3: Cross multiply
   13,737.89x = 18,958.16 × 7,770.72
4. Step 4: Simplify right side
   13,737.89x = 147,318,514.22
5. Step 5: Solve for x
   x = 147,318,514.22/13,737.89
6. Step 6: Final answer
   x = 10,723.52