Finding the Fourth Proportional to 1,009.07, 1,392.17 and 610.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.07 : 1,392.17 = 610.63 : x
2. Step 2: Convert to fraction form
   1,009.07/1,392.17 = 610.63/x
3. Step 3: Cross multiply
   1,009.07x = 1,392.17 × 610.63
4. Step 4: Simplify right side
   1,009.07x = 850,100.77
5. Step 5: Solve for x
   x = 850,100.77/1,009.07
6. Step 6: Final answer
   x = 842.46