Finding the Fourth Proportional to 1,145.54, 1,710.56 and 899.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.54 : 1,710.56 = 899.30 : x
2. Step 2: Convert to fraction form
   1,145.54/1,710.56 = 899.30/x
3. Step 3: Cross multiply
   1,145.54x = 1,710.56 × 899.30
4. Step 4: Simplify right side
   1,145.54x = 1,538,306.61
5. Step 5: Solve for x
   x = 1,538,306.61/1,145.54
6. Step 6: Final answer
   x = 1,342.87