Finding the Fourth Proportional to 1,320.02, 1,821.55 and 722.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.02 : 1,821.55 = 722.50 : x
2. Step 2: Convert to fraction form
   1,320.02/1,821.55 = 722.50/x
3. Step 3: Cross multiply
   1,320.02x = 1,821.55 × 722.50
4. Step 4: Simplify right side
   1,320.02x = 1,316,069.88
5. Step 5: Solve for x
   x = 1,316,069.88/1,320.02
6. Step 6: Final answer
   x = 997.01