Finding the Fourth Proportional to 1,155.42, 1,731.63 and 880.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.42 : 1,731.63 = 880.50 : x
2. Step 2: Convert to fraction form
   1,155.42/1,731.63 = 880.50/x
3. Step 3: Cross multiply
   1,155.42x = 1,731.63 × 880.50
4. Step 4: Simplify right side
   1,155.42x = 1,524,700.22
5. Step 5: Solve for x
   x = 1,524,700.22/1,155.42
6. Step 6: Final answer
   x = 1,319.61