Finding the Fourth Proportional to 1,345.50, 1,857.60 and 880.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.50 : 1,857.60 = 880.56 : x
2. Step 2: Convert to fraction form
   1,345.50/1,857.60 = 880.56/x
3. Step 3: Cross multiply
   1,345.50x = 1,857.60 × 880.56
4. Step 4: Simplify right side
   1,345.50x = 1,635,728.26
5. Step 5: Solve for x
   x = 1,635,728.26/1,345.50
6. Step 6: Final answer
   x = 1,215.70