Finding the Fourth Proportional to 1,345.71, 1,857.89 and 880.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.71 : 1,857.89 = 880.77 : x
2. Step 2: Convert to fraction form
   1,345.71/1,857.89 = 880.77/x
3. Step 3: Cross multiply
   1,345.71x = 1,857.89 × 880.77
4. Step 4: Simplify right side
   1,345.71x = 1,636,373.78
5. Step 5: Solve for x
   x = 1,636,373.78/1,345.71
6. Step 6: Final answer
   x = 1,215.99