Finding the Fourth Proportional to 1,155.83, 1,731.51 and 667.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.83 : 1,731.51 = 667.40 : x
2. Step 2: Convert to fraction form
   1,155.83/1,731.51 = 667.40/x
3. Step 3: Cross multiply
   1,155.83x = 1,731.51 × 667.40
4. Step 4: Simplify right side
   1,155.83x = 1,155,601.12
5. Step 5: Solve for x
   x = 1,155,601.12/1,155.83
6. Step 6: Final answer
   x = 999.81