Finding the Fourth Proportional to 1,378.10, 1,900.82 and 880.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.10 : 1,900.82 = 880.51 : x
2. Step 2: Convert to fraction form
   1,378.10/1,900.82 = 880.51/x
3. Step 3: Cross multiply
   1,378.10x = 1,900.82 × 880.51
4. Step 4: Simplify right side
   1,378.10x = 1,673,688.47
5. Step 5: Solve for x
   x = 1,673,688.47/1,378.10
6. Step 6: Final answer
   x = 1,214.49