Finding the Fourth Proportional to 2,385.72, 3,575.52 and 1,087.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.72 : 3,575.52 = 1,087.20 : x
2. Step 2: Convert to fraction form
   2,385.72/3,575.52 = 1,087.20/x
3. Step 3: Cross multiply
   2,385.72x = 3,575.52 × 1,087.20
4. Step 4: Simplify right side
   2,385.72x = 3,887,305.34
5. Step 5: Solve for x
   x = 3,887,305.34/2,385.72
6. Step 6: Final answer
   x = 1,629.41