Finding the Fourth Proportional to 1,287.83, 1,777.30 and 972.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.83 : 1,777.30 = 972.54 : x
2. Step 2: Convert to fraction form
   1,287.83/1,777.30 = 972.54/x
3. Step 3: Cross multiply
   1,287.83x = 1,777.30 × 972.54
4. Step 4: Simplify right side
   1,287.83x = 1,728,495.34
5. Step 5: Solve for x
   x = 1,728,495.34/1,287.83
6. Step 6: Final answer
   x = 1,342.18