Finding the Fourth Proportional to 13,445.82, 18,555.83 and 7,780.84

Step by Step Solution

1. Step 1: Write the proportion equation
   13,445.82 : 18,555.83 = 7,780.84 : x
2. Step 2: Convert to fraction form
   13,445.82/18,555.83 = 7,780.84/x
3. Step 3: Cross multiply
   13,445.82x = 18,555.83 × 7,780.84
4. Step 4: Simplify right side
   13,445.82x = 144,379,870.97
5. Step 5: Solve for x
   x = 144,379,870.97/13,445.82
6. Step 6: Final answer
   x = 10,737.90