Finding the Fourth Proportional to 51,068.40, 70,475.76 and 30,921

Step by Step Solution

1. Step 1: Write the proportion equation
   51,068.40 : 70,475.76 = 30,921 : x
2. Step 2: Convert to fraction form
   51,068.40/70,475.76 = 30,921/x
3. Step 3: Cross multiply
   51,068.40x = 70,475.76 × 30,921
4. Step 4: Simplify right side
   51,068.40x = 2,179,180,974.96
5. Step 5: Solve for x
   x = 2,179,180,974.96/51,068.40
6. Step 6: Final answer
   x = 42,671.81