Finding the Fourth Proportional to 28,260.59, 42,389.55 and 10,494.78

Step by Step Solution

1. Step 1: Write the proportion equation
   28,260.59 : 42,389.55 = 10,494.78 : x
2. Step 2: Convert to fraction form
   28,260.59/42,389.55 = 10,494.78/x
3. Step 3: Cross multiply
   28,260.59x = 42,389.55 × 10,494.78
4. Step 4: Simplify right side
   28,260.59x = 444,869,160.51
5. Step 5: Solve for x
   x = 444,869,160.51/28,260.59
6. Step 6: Final answer
   x = 15,741.68