Finding the Fourth Proportional to 13,559.74, 18,711.57 and 7,591.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,559.74 : 18,711.57 = 7,591.30 : x
2. Step 2: Convert to fraction form
   13,559.74/18,711.57 = 7,591.30/x
3. Step 3: Cross multiply
   13,559.74x = 18,711.57 × 7,591.30
4. Step 4: Simplify right side
   13,559.74x = 142,045,141.34
5. Step 5: Solve for x
   x = 142,045,141.34/13,559.74
6. Step 6: Final answer
   x = 10,475.51