Finding the Fourth Proportional to 28,339.31, 42,510.45 and 9,619.94

Step by Step Solution

1. Step 1: Write the proportion equation
   28,339.31 : 42,510.45 = 9,619.94 : x
2. Step 2: Convert to fraction form
   28,339.31/42,510.45 = 9,619.94/x
3. Step 3: Cross multiply
   28,339.31x = 42,510.45 × 9,619.94
4. Step 4: Simplify right side
   28,339.31x = 408,947,978.37
5. Step 5: Solve for x
   x = 408,947,978.37/28,339.31
6. Step 6: Final answer
   x = 14,430.41