Finding the Fourth Proportional to 1,488.45, 2,053.59 and 991.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.45 : 2,053.59 = 991.17 : x
2. Step 2: Convert to fraction form
   1,488.45/2,053.59 = 991.17/x
3. Step 3: Cross multiply
   1,488.45x = 2,053.59 × 991.17
4. Step 4: Simplify right side
   1,488.45x = 2,035,453.08
5. Step 5: Solve for x
   x = 2,035,453.08/1,488.45
6. Step 6: Final answer
   x = 1,367.50