Finding the Fourth Proportional to 28,215.72, 42,293.74 and 10,434.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,215.72 : 42,293.74 = 10,434.96 : x
2. Step 2: Convert to fraction form
   28,215.72/42,293.74 = 10,434.96/x
3. Step 3: Cross multiply
   28,215.72x = 42,293.74 × 10,434.96
4. Step 4: Simplify right side
   28,215.72x = 441,333,485.15
5. Step 5: Solve for x
   x = 441,333,485.15/28,215.72
6. Step 6: Final answer
   x = 15,641.40