Finding the Fourth Proportional to 78,470.82, 117,669.38 and 28,515.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,470.82 : 117,669.38 = 28,515.69 : x
2. Step 2: Convert to fraction form
   78,470.82/117,669.38 = 28,515.69/x
3. Step 3: Cross multiply
   78,470.82x = 117,669.38 × 28,515.69
4. Step 4: Simplify right side
   78,470.82x = 3,355,423,419.99
5. Step 5: Solve for x
   x = 3,355,423,419.99/78,470.82
6. Step 6: Final answer
   x = 42,760.14