Finding the Fourth Proportional to 1,378.71, 1,901.82 and 880.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.71 : 1,901.82 = 880.56 : x
2. Step 2: Convert to fraction form
   1,378.71/1,901.82 = 880.56/x
3. Step 3: Cross multiply
   1,378.71x = 1,901.82 × 880.56
4. Step 4: Simplify right side
   1,378.71x = 1,674,666.62
5. Step 5: Solve for x
   x = 1,674,666.62/1,378.71
6. Step 6: Final answer
   x = 1,214.66