Finding the Fourth Proportional to 1,434.65, 1,978.70 and 1,081.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.65 : 1,978.70 = 1,081.76 : x
2. Step 2: Convert to fraction form
   1,434.65/1,978.70 = 1,081.76/x
3. Step 3: Cross multiply
   1,434.65x = 1,978.70 × 1,081.76
4. Step 4: Simplify right side
   1,434.65x = 2,140,463.21
5. Step 5: Solve for x
   x = 2,140,463.21/1,434.65
6. Step 6: Final answer
   x = 1,491.98