Finding the Fourth Proportional to 1,511.67, 2,085.57 and 988.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.67 : 2,085.57 = 988.01 : x
2. Step 2: Convert to fraction form
   1,511.67/2,085.57 = 988.01/x
3. Step 3: Cross multiply
   1,511.67x = 2,085.57 × 988.01
4. Step 4: Simplify right side
   1,511.67x = 2,060,553.59
5. Step 5: Solve for x
   x = 2,060,553.59/1,511.67
6. Step 6: Final answer
   x = 1,363.10