Finding the Fourth Proportional to 1,370.31, 1,890.98 and 772.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.31 : 1,890.98 = 772.83 : x
2. Step 2: Convert to fraction form
   1,370.31/1,890.98 = 772.83/x
3. Step 3: Cross multiply
   1,370.31x = 1,890.98 × 772.83
4. Step 4: Simplify right side
   1,370.31x = 1,461,406.07
5. Step 5: Solve for x
   x = 1,461,406.07/1,370.31
6. Step 6: Final answer
   x = 1,066.48