Finding the Fourth Proportional to 1,380.80, 1,907.52 and 1,277.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.80 : 1,907.52 = 1,277.12 : x
2. Step 2: Convert to fraction form
   1,380.80/1,907.52 = 1,277.12/x
3. Step 3: Cross multiply
   1,380.80x = 1,907.52 × 1,277.12
4. Step 4: Simplify right side
   1,380.80x = 2,436,131.94
5. Step 5: Solve for x
   x = 2,436,131.94/1,380.80
6. Step 6: Final answer
   x = 1,764.29