Finding the Fourth Proportional to 1,331.81, 1,837.72 and 772.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,331.81 : 1,837.72 = 772.24 : x
2. Step 2: Convert to fraction form
   1,331.81/1,837.72 = 772.24/x
3. Step 3: Cross multiply
   1,331.81x = 1,837.72 × 772.24
4. Step 4: Simplify right side
   1,331.81x = 1,419,160.89
5. Step 5: Solve for x
   x = 1,419,160.89/1,331.81
6. Step 6: Final answer
   x = 1,065.59