Finding the Fourth Proportional to 1,010.30, 1,392.90 and 773.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.30 : 1,392.90 = 773.57 : x
2. Step 2: Convert to fraction form
   1,010.30/1,392.90 = 773.57/x
3. Step 3: Cross multiply
   1,010.30x = 1,392.90 × 773.57
4. Step 4: Simplify right side
   1,010.30x = 1,077,498.69
5. Step 5: Solve for x
   x = 1,077,498.69/1,010.30
6. Step 6: Final answer
   x = 1,066.52