Finding the Fourth Proportional to 1,007.19, 1,506.69 and 899.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.19 : 1,506.69 = 899.22 : x
2. Step 2: Convert to fraction form
   1,007.19/1,506.69 = 899.22/x
3. Step 3: Cross multiply
   1,007.19x = 1,506.69 × 899.22
4. Step 4: Simplify right side
   1,007.19x = 1,354,845.78
5. Step 5: Solve for x
   x = 1,354,845.78/1,007.19
6. Step 6: Final answer
   x = 1,345.17