Finding the Fourth Proportional to 1,319.52, 1,820.89 and 721.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,319.52 : 1,820.89 = 721.99 : x
2. Step 2: Convert to fraction form
   1,319.52/1,820.89 = 721.99/x
3. Step 3: Cross multiply
   1,319.52x = 1,820.89 × 721.99
4. Step 4: Simplify right side
   1,319.52x = 1,314,667.55
5. Step 5: Solve for x
   x = 1,314,667.55/1,319.52
6. Step 6: Final answer
   x = 996.32