Finding the Fourth Proportional to 1,396.86, 1,924.34 and 976.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.86 : 1,924.34 = 976.43 : x
2. Step 2: Convert to fraction form
   1,396.86/1,924.34 = 976.43/x
3. Step 3: Cross multiply
   1,396.86x = 1,924.34 × 976.43
4. Step 4: Simplify right side
   1,396.86x = 1,878,973.61
5. Step 5: Solve for x
   x = 1,878,973.61/1,396.86
6. Step 6: Final answer
   x = 1,345.15