Finding the Fourth Proportional to 1,434.13, 1,973.40 and 1,391.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.13 : 1,973.40 = 1,391.31 : x
2. Step 2: Convert to fraction form
   1,434.13/1,973.40 = 1,391.31/x
3. Step 3: Cross multiply
   1,434.13x = 1,973.40 × 1,391.31
4. Step 4: Simplify right side
   1,434.13x = 2,745,611.15
5. Step 5: Solve for x
   x = 2,745,611.15/1,434.13
6. Step 6: Final answer
   x = 1,914.48