Finding the Fourth Proportional to 1,970.63, 2,719.30 and 1,131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.63 : 2,719.30 = 1,131.31 : x
2. Step 2: Convert to fraction form
   1,970.63/2,719.30 = 1,131.31/x
3. Step 3: Cross multiply
   1,970.63x = 2,719.30 × 1,131.31
4. Step 4: Simplify right side
   1,970.63x = 3,076,371.28
5. Step 5: Solve for x
   x = 3,076,371.28/1,970.63
6. Step 6: Final answer
   x = 1,561.11