Finding the Fourth Proportional to 1,511.92, 2,085.96 and 988.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.92 : 2,085.96 = 988.30 : x
2. Step 2: Convert to fraction form
   1,511.92/2,085.96 = 988.30/x
3. Step 3: Cross multiply
   1,511.92x = 2,085.96 × 988.30
4. Step 4: Simplify right side
   1,511.92x = 2,061,554.27
5. Step 5: Solve for x
   x = 2,061,554.27/1,511.92
6. Step 6: Final answer
   x = 1,363.53