Finding the Fourth Proportional to 1,920.40, 2,877.54 and 1,397.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.40 : 2,877.54 = 1,397.99 : x
2. Step 2: Convert to fraction form
   1,920.40/2,877.54 = 1,397.99/x
3. Step 3: Cross multiply
   1,920.40x = 2,877.54 × 1,397.99
4. Step 4: Simplify right side
   1,920.40x = 4,022,779.34
5. Step 5: Solve for x
   x = 4,022,779.34/1,920.40
6. Step 6: Final answer
   x = 2,094.76