Finding the Fourth Proportional to 1,528.58, 2,290.47 and 1,182.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.58 : 2,290.47 = 1,182.78 : x
2. Step 2: Convert to fraction form
   1,528.58/2,290.47 = 1,182.78/x
3. Step 3: Cross multiply
   1,528.58x = 2,290.47 × 1,182.78
4. Step 4: Simplify right side
   1,528.58x = 2,709,110.65
5. Step 5: Solve for x
   x = 2,709,110.65/1,528.58
6. Step 6: Final answer
   x = 1,772.31