Finding the Fourth Proportional to 1,321.93, 1,981.33 and 541.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.93 : 1,981.33 = 541.45 : x
2. Step 2: Convert to fraction form
   1,321.93/1,981.33 = 541.45/x
3. Step 3: Cross multiply
   1,321.93x = 1,981.33 × 541.45
4. Step 4: Simplify right side
   1,321.93x = 1,072,784.82
5. Step 5: Solve for x
   x = 1,072,784.82/1,321.93
6. Step 6: Final answer
   x = 811.53