Finding the Fourth Proportional to 1,074.56, 1,610.88 and 981.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.56 : 1,610.88 = 981.76 : x
2. Step 2: Convert to fraction form
   1,074.56/1,610.88 = 981.76/x
3. Step 3: Cross multiply
   1,074.56x = 1,610.88 × 981.76
4. Step 4: Simplify right side
   1,074.56x = 1,581,497.55
5. Step 5: Solve for x
   x = 1,581,497.55/1,074.56
6. Step 6: Final answer
   x = 1,471.76