Finding the Fourth Proportional to 1,071.61, 1,603.67 and 898.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.61 : 1,603.67 = 898.47 : x
2. Step 2: Convert to fraction form
   1,071.61/1,603.67 = 898.47/x
3. Step 3: Cross multiply
   1,071.61x = 1,603.67 × 898.47
4. Step 4: Simplify right side
   1,071.61x = 1,440,844.89
5. Step 5: Solve for x
   x = 1,440,844.89/1,071.61
6. Step 6: Final answer
   x = 1,344.56