Finding the Fourth Proportional to 1,970.40, 2,719.72 and 1,381.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.40 : 2,719.72 = 1,381.08 : x
2. Step 2: Convert to fraction form
   1,970.40/2,719.72 = 1,381.08/x
3. Step 3: Cross multiply
   1,970.40x = 2,719.72 × 1,381.08
4. Step 4: Simplify right side
   1,970.40x = 3,756,150.90
5. Step 5: Solve for x
   x = 3,756,150.90/1,970.40
6. Step 6: Final answer
   x = 1,906.29