Finding the Fourth Proportional to 1,423.56, 1,964.88 and 899.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.56 : 1,964.88 = 899.88 : x
2. Step 2: Convert to fraction form
   1,423.56/1,964.88 = 899.88/x
3. Step 3: Cross multiply
   1,423.56x = 1,964.88 × 899.88
4. Step 4: Simplify right side
   1,423.56x = 1,768,156.21
5. Step 5: Solve for x
   x = 1,768,156.21/1,423.56
6. Step 6: Final answer
   x = 1,242.07