Finding the Fourth Proportional to 28,613.28, 42,911.72 and 8,624.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,613.28 : 42,911.72 = 8,624.72 : x
2. Step 2: Convert to fraction form
   28,613.28/42,911.72 = 8,624.72/x
3. Step 3: Cross multiply
   28,613.28x = 42,911.72 × 8,624.72
4. Step 4: Simplify right side
   28,613.28x = 370,101,312.04
5. Step 5: Solve for x
   x = 370,101,312.04/28,613.28
6. Step 6: Final answer
   x = 12,934.60