Finding the Fourth Proportional to 315,011.76, 472,473.39 and 90,391.33

Step by Step Solution

1. Step 1: Write the proportion equation
   315,011.76 : 472,473.39 = 90,391.33 : x
2. Step 2: Convert to fraction form
   315,011.76/472,473.39 = 90,391.33/x
3. Step 3: Cross multiply
   315,011.76x = 472,473.39 × 90,391.33
4. Step 4: Simplify right side
   315,011.76x = 42,707,498,111.71
5. Step 5: Solve for x
   x = 42,707,498,111.71/315,011.76
6. Step 6: Final answer
   x = 135,574.30