Finding the Fourth Proportional to 1,380.77, 1,904.42 and 976.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.77 : 1,904.42 = 976.82 : x
2. Step 2: Convert to fraction form
   1,380.77/1,904.42 = 976.82/x
3. Step 3: Cross multiply
   1,380.77x = 1,904.42 × 976.82
4. Step 4: Simplify right side
   1,380.77x = 1,860,261.14
5. Step 5: Solve for x
   x = 1,860,261.14/1,380.77
6. Step 6: Final answer
   x = 1,347.27