Finding the Fourth Proportional to 1,321.58, 1,981.50 and 498.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.58 : 1,981.50 = 498.86 : x
2. Step 2: Convert to fraction form
   1,321.58/1,981.50 = 498.86/x
3. Step 3: Cross multiply
   1,321.58x = 1,981.50 × 498.86
4. Step 4: Simplify right side
   1,321.58x = 988,491.09
5. Step 5: Solve for x
   x = 988,491.09/1,321.58
6. Step 6: Final answer
   x = 747.96