Finding the Fourth Proportional to 1,528.76, 2,291.78 and 748.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.76 : 2,291.78 = 748.34 : x
2. Step 2: Convert to fraction form
   1,528.76/2,291.78 = 748.34/x
3. Step 3: Cross multiply
   1,528.76x = 2,291.78 × 748.34
4. Step 4: Simplify right side
   1,528.76x = 1,715,030.65
5. Step 5: Solve for x
   x = 1,715,030.65/1,528.76
6. Step 6: Final answer
   x = 1,121.84