Finding the Fourth Proportional to 28,031.69, 42,055.66 and 8,310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,031.69 : 42,055.66 = 8,310.72 : x
2. Step 2: Convert to fraction form
   28,031.69/42,055.66 = 8,310.72/x
3. Step 3: Cross multiply
   28,031.69x = 42,055.66 × 8,310.72
4. Step 4: Simplify right side
   28,031.69x = 349,512,699.46
5. Step 5: Solve for x
   x = 349,512,699.46/28,031.69
6. Step 6: Final answer
   x = 12,468.49