Finding the Fourth Proportional to 1,410.76, 1,947.25 and 991.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.76 : 1,947.25 = 991.21 : x
2. Step 2: Convert to fraction form
   1,410.76/1,947.25 = 991.21/x
3. Step 3: Cross multiply
   1,410.76x = 1,947.25 × 991.21
4. Step 4: Simplify right side
   1,410.76x = 1,930,126.33
5. Step 5: Solve for x
   x = 1,930,126.33/1,410.76
6. Step 6: Final answer
   x = 1,368.15