Finding the Fourth Proportional to 12,561.66, 18,817.86 and 7,285.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,561.66 : 18,817.86 = 7,285.59 : x
2. Step 2: Convert to fraction form
   12,561.66/18,817.86 = 7,285.59/x
3. Step 3: Cross multiply
   12,561.66x = 18,817.86 × 7,285.59
4. Step 4: Simplify right side
   12,561.66x = 137,099,085.87
5. Step 5: Solve for x
   x = 137,099,085.87/12,561.66
6. Step 6: Final answer
   x = 10,914.09