Finding the Fourth Proportional to 28,406.42, 42,615.78 and 10,876.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,406.42 : 42,615.78 = 10,876.25 : x
2. Step 2: Convert to fraction form
   28,406.42/42,615.78 = 10,876.25/x
3. Step 3: Cross multiply
   28,406.42x = 42,615.78 × 10,876.25
4. Step 4: Simplify right side
   28,406.42x = 463,499,877.23
5. Step 5: Solve for x
   x = 463,499,877.23/28,406.42
6. Step 6: Final answer
   x = 16,316.73