Finding the Fourth Proportional to 1,947.30, 2,921.46 and 851.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.30 : 2,921.46 = 851.88 : x
2. Step 2: Convert to fraction form
   1,947.30/2,921.46 = 851.88/x
3. Step 3: Cross multiply
   1,947.30x = 2,921.46 × 851.88
4. Step 4: Simplify right side
   1,947.30x = 2,488,733.34
5. Step 5: Solve for x
   x = 2,488,733.34/1,947.30
6. Step 6: Final answer
   x = 1,278.04