Finding the Fourth Proportional to 1,225.59, 1,692.69 and 831.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.59 : 1,692.69 = 831.93 : x
2. Step 2: Convert to fraction form
   1,225.59/1,692.69 = 831.93/x
3. Step 3: Cross multiply
   1,225.59x = 1,692.69 × 831.93
4. Step 4: Simplify right side
   1,225.59x = 1,408,199.59
5. Step 5: Solve for x
   x = 1,408,199.59/1,225.59
6. Step 6: Final answer
   x = 1,149.00