Finding the Fourth Proportional to 1,559.76, 2,151.72 and 970.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.76 : 2,151.72 = 970.98 : x
2. Step 2: Convert to fraction form
   1,559.76/2,151.72 = 970.98/x
3. Step 3: Cross multiply
   1,559.76x = 2,151.72 × 970.98
4. Step 4: Simplify right side
   1,559.76x = 2,089,277.09
5. Step 5: Solve for x
   x = 2,089,277.09/1,559.76
6. Step 6: Final answer
   x = 1,339.49