Finding the Fourth Proportional to 1,528.02, 2,108.55 and 898.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.02 : 2,108.55 = 898.57 : x
2. Step 2: Convert to fraction form
   1,528.02/2,108.55 = 898.57/x
3. Step 3: Cross multiply
   1,528.02x = 2,108.55 × 898.57
4. Step 4: Simplify right side
   1,528.02x = 1,894,680.72
5. Step 5: Solve for x
   x = 1,894,680.72/1,528.02
6. Step 6: Final answer
   x = 1,239.96