Finding the Fourth Proportional to 1,378.59, 1,906.20 and 1,356.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.59 : 1,906.20 = 1,356.34 : x
2. Step 2: Convert to fraction form
   1,378.59/1,906.20 = 1,356.34/x
3. Step 3: Cross multiply
   1,378.59x = 1,906.20 × 1,356.34
4. Step 4: Simplify right side
   1,378.59x = 2,585,455.31
5. Step 5: Solve for x
   x = 2,585,455.31/1,378.59
6. Step 6: Final answer
   x = 1,875.43