Finding the Fourth Proportional to 1,372.64, 1,896.73 and 978.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.64 : 1,896.73 = 978.98 : x
2. Step 2: Convert to fraction form
   1,372.64/1,896.73 = 978.98/x
3. Step 3: Cross multiply
   1,372.64x = 1,896.73 × 978.98
4. Step 4: Simplify right side
   1,372.64x = 1,856,848.80
5. Step 5: Solve for x
   x = 1,856,848.80/1,372.64
6. Step 6: Final answer
   x = 1,352.76