Finding the Fourth Proportional to 1,312.30, 1,810.98 and 722.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312.30 : 1,810.98 = 722.89 : x
2. Step 2: Convert to fraction form
   1,312.30/1,810.98 = 722.89/x
3. Step 3: Cross multiply
   1,312.30x = 1,810.98 × 722.89
4. Step 4: Simplify right side
   1,312.30x = 1,309,139.33
5. Step 5: Solve for x
   x = 1,309,139.33/1,312.30
6. Step 6: Final answer
   x = 997.59