Finding the Fourth Proportional to 1,145.72, 1,715.82 and 899.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.72 : 1,715.82 = 899.67 : x
2. Step 2: Convert to fraction form
   1,145.72/1,715.82 = 899.67/x
3. Step 3: Cross multiply
   1,145.72x = 1,715.82 × 899.67
4. Step 4: Simplify right side
   1,145.72x = 1,543,671.78
5. Step 5: Solve for x
   x = 1,543,671.78/1,145.72
6. Step 6: Final answer
   x = 1,347.34