Finding the Fourth Proportional to 28,279.86, 42,357.42 and 17,715.48

Step by Step Solution

1. Step 1: Write the proportion equation
   28,279.86 : 42,357.42 = 17,715.48 : x
2. Step 2: Convert to fraction form
   28,279.86/42,357.42 = 17,715.48/x
3. Step 3: Cross multiply
   28,279.86x = 42,357.42 × 17,715.48
4. Step 4: Simplify right side
   28,279.86x = 750,382,026.86
5. Step 5: Solve for x
   x = 750,382,026.86/28,279.86
6. Step 6: Final answer
   x = 26,534.15