Finding the Fourth Proportional to 1,081.55, 1,488.86 and 970.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.55 : 1,488.86 = 970.98 : x
2. Step 2: Convert to fraction form
   1,081.55/1,488.86 = 970.98/x
3. Step 3: Cross multiply
   1,081.55x = 1,488.86 × 970.98
4. Step 4: Simplify right side
   1,081.55x = 1,445,653.28
5. Step 5: Solve for x
   x = 1,445,653.28/1,081.55
6. Step 6: Final answer
   x = 1,336.65