Finding the Fourth Proportional to 28,429.98, 42,650.43 and 8,708.70

Step by Step Solution

1. Step 1: Write the proportion equation
   28,429.98 : 42,650.43 = 8,708.70 : x
2. Step 2: Convert to fraction form
   28,429.98/42,650.43 = 8,708.70/x
3. Step 3: Cross multiply
   28,429.98x = 42,650.43 × 8,708.70
4. Step 4: Simplify right side
   28,429.98x = 371,429,799.74
5. Step 5: Solve for x
   x = 371,429,799.74/28,429.98
6. Step 6: Final answer
   x = 13,064.72