Finding the Fourth Proportional to 1,488.17, 2,053.63 and 815.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.17 : 2,053.63 = 815.96 : x
2. Step 2: Convert to fraction form
   1,488.17/2,053.63 = 815.96/x
3. Step 3: Cross multiply
   1,488.17x = 2,053.63 × 815.96
4. Step 4: Simplify right side
   1,488.17x = 1,675,665.59
5. Step 5: Solve for x
   x = 1,675,665.59/1,488.17
6. Step 6: Final answer
   x = 1,125.99