Finding the Fourth Proportional to 13,561.18, 18,715.47 and 7,897.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,561.18 : 18,715.47 = 7,897.69 : x
2. Step 2: Convert to fraction form
   13,561.18/18,715.47 = 7,897.69/x
3. Step 3: Cross multiply
   13,561.18x = 18,715.47 × 7,897.69
4. Step 4: Simplify right side
   13,561.18x = 147,808,980.26
5. Step 5: Solve for x
   x = 147,808,980.26/13,561.18
6. Step 6: Final answer
   x = 10,899.42