Finding the Fourth Proportional to 1,393.30, 2,087.67 and 981.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.30 : 2,087.67 = 981.72 : x
2. Step 2: Convert to fraction form
   1,393.30/2,087.67 = 981.72/x
3. Step 3: Cross multiply
   1,393.30x = 2,087.67 × 981.72
4. Step 4: Simplify right side
   1,393.30x = 2,049,511.07
5. Step 5: Solve for x
   x = 2,049,511.07/1,393.30
6. Step 6: Final answer
   x = 1,470.97