Finding the Fourth Proportional to 1,321.07, 1,980.20 and 498.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.07 : 1,980.20 = 498.98 : x
2. Step 2: Convert to fraction form
   1,321.07/1,980.20 = 498.98/x
3. Step 3: Cross multiply
   1,321.07x = 1,980.20 × 498.98
4. Step 4: Simplify right side
   1,321.07x = 988,086.39
5. Step 5: Solve for x
   x = 988,086.39/1,321.07
6. Step 6: Final answer
   x = 747.95