Finding the Fourth Proportional to 28,978.50, 39,990.52 and 17,042.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,978.50 : 39,990.52 = 17,042.34 : x
2. Step 2: Convert to fraction form
   28,978.50/39,990.52 = 17,042.34/x
3. Step 3: Cross multiply
   28,978.50x = 39,990.52 × 17,042.34
4. Step 4: Simplify right side
   28,978.50x = 681,532,038.62
5. Step 5: Solve for x
   x = 681,532,038.62/28,978.50
6. Step 6: Final answer
   x = 23,518.54