Finding the Fourth Proportional to 1,312.02, 1,810.50 and 722.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312.02 : 1,810.50 = 722.55 : x
2. Step 2: Convert to fraction form
   1,312.02/1,810.50 = 722.55/x
3. Step 3: Cross multiply
   1,312.02x = 1,810.50 × 722.55
4. Step 4: Simplify right side
   1,312.02x = 1,308,176.78
5. Step 5: Solve for x
   x = 1,308,176.78/1,312.02
6. Step 6: Final answer
   x = 997.07