Finding the Fourth Proportional to 1,407.44, 1,939.56 and 992.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.44 : 1,939.56 = 992.72 : x
2. Step 2: Convert to fraction form
   1,407.44/1,939.56 = 992.72/x
3. Step 3: Cross multiply
   1,407.44x = 1,939.56 × 992.72
4. Step 4: Simplify right side
   1,407.44x = 1,925,440.00
5. Step 5: Solve for x
   x = 1,925,440.00/1,407.44
6. Step 6: Final answer
   x = 1,368.04