Finding the Fourth Proportional to 1,131.30, 1,560.78 and 738.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.30 : 1,560.78 = 738.90 : x
2. Step 2: Convert to fraction form
   1,131.30/1,560.78 = 738.90/x
3. Step 3: Cross multiply
   1,131.30x = 1,560.78 × 738.90
4. Step 4: Simplify right side
   1,131.30x = 1,153,260.34
5. Step 5: Solve for x
   x = 1,153,260.34/1,131.30
6. Step 6: Final answer
   x = 1,019.41