Finding the Fourth Proportional to 28,042.12, 42,058.72 and 9,320.59

Step by Step Solution

1. Step 1: Write the proportion equation
   28,042.12 : 42,058.72 = 9,320.59 : x
2. Step 2: Convert to fraction form
   28,042.12/42,058.72 = 9,320.59/x
3. Step 3: Cross multiply
   28,042.12x = 42,058.72 × 9,320.59
4. Step 4: Simplify right side
   28,042.12x = 392,012,085.04
5. Step 5: Solve for x
   x = 392,012,085.04/28,042.12
6. Step 6: Final answer
   x = 13,979.40