Finding the Fourth Proportional to 28,405.17, 42,592.69 and 8,411.92

Step by Step Solution

1. Step 1: Write the proportion equation
   28,405.17 : 42,592.69 = 8,411.92 : x
2. Step 2: Convert to fraction form
   28,405.17/42,592.69 = 8,411.92/x
3. Step 3: Cross multiply
   28,405.17x = 42,592.69 × 8,411.92
4. Step 4: Simplify right side
   28,405.17x = 358,286,300.86
5. Step 5: Solve for x
   x = 358,286,300.86/28,405.17
6. Step 6: Final answer
   x = 12,613.42