Finding the Fourth Proportional to 1,947.10, 2,921.52 and 1,057.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.10 : 2,921.52 = 1,057.90 : x
2. Step 2: Convert to fraction form
   1,947.10/2,921.52 = 1,057.90/x
3. Step 3: Cross multiply
   1,947.10x = 2,921.52 × 1,057.90
4. Step 4: Simplify right side
   1,947.10x = 3,090,676.01
5. Step 5: Solve for x
   x = 3,090,676.01/1,947.10
6. Step 6: Final answer
   x = 1,587.32