Finding the Fourth Proportional to 1,128.88, 1,692.72 and 580.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.88 : 1,692.72 = 580.84 : x
2. Step 2: Convert to fraction form
   1,128.88/1,692.72 = 580.84/x
3. Step 3: Cross multiply
   1,128.88x = 1,692.72 × 580.84
4. Step 4: Simplify right side
   1,128.88x = 983,199.48
5. Step 5: Solve for x
   x = 983,199.48/1,128.88
6. Step 6: Final answer
   x = 870.95