Finding the Fourth Proportional to 1,488.72, 2,234.40 and 758.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.72 : 2,234.40 = 758.76 : x
2. Step 2: Convert to fraction form
   1,488.72/2,234.40 = 758.76/x
3. Step 3: Cross multiply
   1,488.72x = 2,234.40 × 758.76
4. Step 4: Simplify right side
   1,488.72x = 1,695,373.34
5. Step 5: Solve for x
   x = 1,695,373.34/1,488.72
6. Step 6: Final answer
   x = 1,138.81