Finding the Fourth Proportional to 2,561.58, 3,842.88 and 917.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.58 : 3,842.88 = 917.69 : x
2. Step 2: Convert to fraction form
   2,561.58/3,842.88 = 917.69/x
3. Step 3: Cross multiply
   2,561.58x = 3,842.88 × 917.69
4. Step 4: Simplify right side
   2,561.58x = 3,526,572.55
5. Step 5: Solve for x
   x = 3,526,572.55/2,561.58
6. Step 6: Final answer
   x = 1,376.72