Finding the Fourth Proportional to 1,970.64, 2,719.06 and 1,131.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.64 : 2,719.06 = 1,131.61 : x
2. Step 2: Convert to fraction form
   1,970.64/2,719.06 = 1,131.61/x
3. Step 3: Cross multiply
   1,970.64x = 2,719.06 × 1,131.61
4. Step 4: Simplify right side
   1,970.64x = 3,076,915.49
5. Step 5: Solve for x
   x = 3,076,915.49/1,970.64
6. Step 6: Final answer
   x = 1,561.38