Finding the Fourth Proportional to 7,725.56, 10,661.27 and 4,188.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,725.56 : 10,661.27 = 4,188.78 : x
2. Step 2: Convert to fraction form
   7,725.56/10,661.27 = 4,188.78/x
3. Step 3: Cross multiply
   7,725.56x = 10,661.27 × 4,188.78
4. Step 4: Simplify right side
   7,725.56x = 44,657,693.61
5. Step 5: Solve for x
   x = 44,657,693.61/7,725.56
6. Step 6: Final answer
   x = 5,780.52