Finding the Fourth Proportional to 42,279.76, 58,369.98 and 28,870.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,279.76 : 58,369.98 = 28,870.48 : x
2. Step 2: Convert to fraction form
   42,279.76/58,369.98 = 28,870.48/x
3. Step 3: Cross multiply
   42,279.76x = 58,369.98 × 28,870.48
4. Step 4: Simplify right side
   42,279.76x = 1,685,169,340.19
5. Step 5: Solve for x
   x = 1,685,169,340.19/42,279.76
6. Step 6: Final answer
   x = 39,857.59