Finding the Fourth Proportional to 78,320.76, 117,443.88 and 28,391.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,320.76 : 117,443.88 = 28,391.28 : x
2. Step 2: Convert to fraction form
   78,320.76/117,443.88 = 28,391.28/x
3. Step 3: Cross multiply
   78,320.76x = 117,443.88 × 28,391.28
4. Step 4: Simplify right side
   78,320.76x = 3,334,382,081.37
5. Step 5: Solve for x
   x = 3,334,382,081.37/78,320.76
6. Step 6: Final answer
   x = 42,573.41