Finding the Fourth Proportional to 1,280.45, 1,919.00 and 1,248.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.45 : 1,919.00 = 1,248.25 : x
2. Step 2: Convert to fraction form
   1,280.45/1,919.00 = 1,248.25/x
3. Step 3: Cross multiply
   1,280.45x = 1,919.00 × 1,248.25
4. Step 4: Simplify right side
   1,280.45x = 2,395,385.51
5. Step 5: Solve for x
   x = 2,395,385.51/1,280.45
6. Step 6: Final answer
   x = 1,870.74