Finding the Fourth Proportional to 28,402.34, 42,603.62 and 8,680.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,402.34 : 42,603.62 = 8,680.82 : x
2. Step 2: Convert to fraction form
   28,402.34/42,603.62 = 8,680.82/x
3. Step 3: Cross multiply
   28,402.34x = 42,603.62 × 8,680.82
4. Step 4: Simplify right side
   28,402.34x = 369,834,100.15
5. Step 5: Solve for x
   x = 369,834,100.15/28,402.34
6. Step 6: Final answer
   x = 13,021.26