Finding the Fourth Proportional to 1,692.38, 2,538.56 and 870.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,692.38 : 2,538.56 = 870.89 : x
2. Step 2: Convert to fraction form
   1,692.38/2,538.56 = 870.89/x
3. Step 3: Cross multiply
   1,692.38x = 2,538.56 × 870.89
4. Step 4: Simplify right side
   1,692.38x = 2,210,796.00
5. Step 5: Solve for x
   x = 2,210,796.00/1,692.38
6. Step 6: Final answer
   x = 1,306.32