Finding the Fourth Proportional to 1,393.25, 1,921.80 and 973.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.25 : 1,921.80 = 973.45 : x
2. Step 2: Convert to fraction form
   1,393.25/1,921.80 = 973.45/x
3. Step 3: Cross multiply
   1,393.25x = 1,921.80 × 973.45
4. Step 4: Simplify right side
   1,393.25x = 1,870,776.21
5. Step 5: Solve for x
   x = 1,870,776.21/1,393.25
6. Step 6: Final answer
   x = 1,342.74