Finding the Fourth Proportional to 2,087.30, 3,132.50 and 991.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.30 : 3,132.50 = 991.67 : x
2. Step 2: Convert to fraction form
   2,087.30/3,132.50 = 991.67/x
3. Step 3: Cross multiply
   2,087.30x = 3,132.50 × 991.67
4. Step 4: Simplify right side
   2,087.30x = 3,106,385.65
5. Step 5: Solve for x
   x = 3,106,385.65/2,087.30
6. Step 6: Final answer
   x = 1,488.23