Finding the Fourth Proportional to 78,461.37, 117,689.88 and 28,542.39

Step by Step Solution

1. Step 1: Write the proportion equation
   78,461.37 : 117,689.88 = 28,542.39 : x
2. Step 2: Convert to fraction form
   78,461.37/117,689.88 = 28,542.39/x
3. Step 3: Cross multiply
   78,461.37x = 117,689.88 × 28,542.39
4. Step 4: Simplify right side
   78,461.37x = 3,359,150,454.01
5. Step 5: Solve for x
   x = 3,359,150,454.01/78,461.37
6. Step 6: Final answer
   x = 42,812.79