Finding the Fourth Proportional to 2,385.62, 3,579.42 and 1,288.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.62 : 3,579.42 = 1,288.70 : x
2. Step 2: Convert to fraction form
   2,385.62/3,579.42 = 1,288.70/x
3. Step 3: Cross multiply
   2,385.62x = 3,579.42 × 1,288.70
4. Step 4: Simplify right side
   2,385.62x = 4,612,798.55
5. Step 5: Solve for x
   x = 4,612,798.55/2,385.62
6. Step 6: Final answer
   x = 1,933.58