Finding the Fourth Proportional to 28,039.86, 42,063.98 and 8,316.09

Step by Step Solution

1. Step 1: Write the proportion equation
   28,039.86 : 42,063.98 = 8,316.09 : x
2. Step 2: Convert to fraction form
   28,039.86/42,063.98 = 8,316.09/x
3. Step 3: Cross multiply
   28,039.86x = 42,063.98 × 8,316.09
4. Step 4: Simplify right side
   28,039.86x = 349,807,801.86
5. Step 5: Solve for x
   x = 349,807,801.86/28,039.86
6. Step 6: Final answer
   x = 12,475.38