Finding the Fourth Proportional to 8,780.05, 13,158.45 and 4,611.53

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.05 : 13,158.45 = 4,611.53 : x
2. Step 2: Convert to fraction form
   8,780.05/13,158.45 = 4,611.53/x
3. Step 3: Cross multiply
   8,780.05x = 13,158.45 × 4,611.53
4. Step 4: Simplify right side
   8,780.05x = 60,680,619.82
5. Step 5: Solve for x
   x = 60,680,619.82/8,780.05
6. Step 6: Final answer
   x = 6,911.20