Finding the Fourth Proportional to 42,388.83, 58,507.34 and 28,965.51

Step by Step Solution

1. Step 1: Write the proportion equation
   42,388.83 : 58,507.34 = 28,965.51 : x
2. Step 2: Convert to fraction form
   42,388.83/58,507.34 = 28,965.51/x
3. Step 3: Cross multiply
   42,388.83x = 58,507.34 × 28,965.51
4. Step 4: Simplify right side
   42,388.83x = 1,694,694,797.02
5. Step 5: Solve for x
   x = 1,694,694,797.02/42,388.83
6. Step 6: Final answer
   x = 39,979.75