Finding the Fourth Proportional to 1,053.30, 1,453.74 and 611.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.30 : 1,453.74 = 611.31 : x
2. Step 2: Convert to fraction form
   1,053.30/1,453.74 = 611.31/x
3. Step 3: Cross multiply
   1,053.30x = 1,453.74 × 611.31
4. Step 4: Simplify right side
   1,053.30x = 888,685.80
5. Step 5: Solve for x
   x = 888,685.80/1,053.30
6. Step 6: Final answer
   x = 843.72