Finding the Fourth Proportional to 10,147.94, 15,221.72 and 3,909.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,147.94 : 15,221.72 = 3,909.30 : x
2. Step 2: Convert to fraction form
   10,147.94/15,221.72 = 3,909.30/x
3. Step 3: Cross multiply
   10,147.94x = 15,221.72 × 3,909.30
4. Step 4: Simplify right side
   10,147.94x = 59,506,279.77
5. Step 5: Solve for x
   x = 59,506,279.77/10,147.94
6. Step 6: Final answer
   x = 5,863.88