Finding the Fourth Proportional to 1,113.18, 1,532.69 and 980.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.18 : 1,532.69 = 980.31 : x
2. Step 2: Convert to fraction form
   1,113.18/1,532.69 = 980.31/x
3. Step 3: Cross multiply
   1,113.18x = 1,532.69 × 980.31
4. Step 4: Simplify right side
   1,113.18x = 1,502,506.43
5. Step 5: Solve for x
   x = 1,502,506.43/1,113.18
6. Step 6: Final answer
   x = 1,349.74