Finding the Fourth Proportional to 1,970.78, 2,719.38 and 1,131.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.78 : 2,719.38 = 1,131.53 : x
2. Step 2: Convert to fraction form
   1,970.78/2,719.38 = 1,131.53/x
3. Step 3: Cross multiply
   1,970.78x = 2,719.38 × 1,131.53
4. Step 4: Simplify right side
   1,970.78x = 3,077,046.45
5. Step 5: Solve for x
   x = 3,077,046.45/1,970.78
6. Step 6: Final answer
   x = 1,561.33