Finding the Fourth Proportional to 2,748.65, 4,122.55 and 899.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,748.65 : 4,122.55 = 899.78 : x
2. Step 2: Convert to fraction form
   2,748.65/4,122.55 = 899.78/x
3. Step 3: Cross multiply
   2,748.65x = 4,122.55 × 899.78
4. Step 4: Simplify right side
   2,748.65x = 3,709,388.04
5. Step 5: Solve for x
   x = 3,709,388.04/2,748.65
6. Step 6: Final answer
   x = 1,349.53