Finding the Fourth Proportional to 11,861, 16,375.02 and 9,071.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,861 : 16,375.02 = 9,071.72 : x
2. Step 2: Convert to fraction form
   11,861/16,375.02 = 9,071.72/x
3. Step 3: Cross multiply
   11,861x = 16,375.02 × 9,071.72
4. Step 4: Simplify right side
   11,861x = 148,549,596.43
5. Step 5: Solve for x
   x = 148,549,596.43/11,861
6. Step 6: Final answer
   x = 12,524.21