Finding the Fourth Proportional to 1,488.59, 2,054.28 and 816.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.59 : 2,054.28 = 816.45 : x
2. Step 2: Convert to fraction form
   1,488.59/2,054.28 = 816.45/x
3. Step 3: Cross multiply
   1,488.59x = 2,054.28 × 816.45
4. Step 4: Simplify right side
   1,488.59x = 1,677,216.91
5. Step 5: Solve for x
   x = 1,677,216.91/1,488.59
6. Step 6: Final answer
   x = 1,126.72