Finding the Fourth Proportional to 1,380.31, 1,906.30 and 1,348.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.31 : 1,906.30 = 1,348.52 : x
2. Step 2: Convert to fraction form
   1,380.31/1,906.30 = 1,348.52/x
3. Step 3: Cross multiply
   1,380.31x = 1,906.30 × 1,348.52
4. Step 4: Simplify right side
   1,380.31x = 2,570,685.07
5. Step 5: Solve for x
   x = 2,570,685.07/1,380.31
6. Step 6: Final answer
   x = 1,862.40