Finding the Fourth Proportional to 1,986.72, 2,976.10 and 947.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.72 : 2,976.10 = 947.73 : x
2. Step 2: Convert to fraction form
   1,986.72/2,976.10 = 947.73/x
3. Step 3: Cross multiply
   1,986.72x = 2,976.10 × 947.73
4. Step 4: Simplify right side
   1,986.72x = 2,820,539.25
5. Step 5: Solve for x
   x = 2,820,539.25/1,986.72
6. Step 6: Final answer
   x = 1,419.70