Finding the Fourth Proportional to 1,002.51, 1,384.09 and 722.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.51 : 1,384.09 = 722.55 : x
2. Step 2: Convert to fraction form
   1,002.51/1,384.09 = 722.55/x
3. Step 3: Cross multiply
   1,002.51x = 1,384.09 × 722.55
4. Step 4: Simplify right side
   1,002.51x = 1,000,077.61
5. Step 5: Solve for x
   x = 1,000,077.61/1,002.51
6. Step 6: Final answer
   x = 997.57