Finding the Fourth Proportional to 1,422.42, 1,961.91 and 899.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.42 : 1,961.91 = 899.16 : x
2. Step 2: Convert to fraction form
   1,422.42/1,961.91 = 899.16/x
3. Step 3: Cross multiply
   1,422.42x = 1,961.91 × 899.16
4. Step 4: Simplify right side
   1,422.42x = 1,764,071.00
5. Step 5: Solve for x
   x = 1,764,071.00/1,422.42
6. Step 6: Final answer
   x = 1,240.19