Finding the Fourth Proportional to 2,405.61, 3,608.72 and 761.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.61 : 3,608.72 = 761.57 : x
2. Step 2: Convert to fraction form
   2,405.61/3,608.72 = 761.57/x
3. Step 3: Cross multiply
   2,405.61x = 3,608.72 × 761.57
4. Step 4: Simplify right side
   2,405.61x = 2,748,287.43
5. Step 5: Solve for x
   x = 2,748,287.43/2,405.61
6. Step 6: Final answer
   x = 1,142.45