Finding the Fourth Proportional to 39,891.97, 55,077.33 and 30,800.80

Step by Step Solution

1. Step 1: Write the proportion equation
   39,891.97 : 55,077.33 = 30,800.80 : x
2. Step 2: Convert to fraction form
   39,891.97/55,077.33 = 30,800.80/x
3. Step 3: Cross multiply
   39,891.97x = 55,077.33 × 30,800.80
4. Step 4: Simplify right side
   39,891.97x = 1,696,425,825.86
5. Step 5: Solve for x
   x = 1,696,425,825.86/39,891.97
6. Step 6: Final answer
   x = 42,525.50