Finding the Fourth Proportional to 1,385.74, 2,079.72 and 692.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.74 : 2,079.72 = 692.38 : x
2. Step 2: Convert to fraction form
   1,385.74/2,079.72 = 692.38/x
3. Step 3: Cross multiply
   1,385.74x = 2,079.72 × 692.38
4. Step 4: Simplify right side
   1,385.74x = 1,439,956.53
5. Step 5: Solve for x
   x = 1,439,956.53/1,385.74
6. Step 6: Final answer
   x = 1,039.12