Finding the Fourth Proportional to 47,081.71, 64,928.16 and 30,920.57

Step by Step Solution

1. Step 1: Write the proportion equation
   47,081.71 : 64,928.16 = 30,920.57 : x
2. Step 2: Convert to fraction form
   47,081.71/64,928.16 = 30,920.57/x
3. Step 3: Cross multiply
   47,081.71x = 64,928.16 × 30,920.57
4. Step 4: Simplify right side
   47,081.71x = 2,007,615,822.04
5. Step 5: Solve for x
   x = 2,007,615,822.04/47,081.71
6. Step 6: Final answer
   x = 42,641.10