Finding the Fourth Proportional to 1,872.86, 2,809.71 and 556.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.86 : 2,809.71 = 556.72 : x
2. Step 2: Convert to fraction form
   1,872.86/2,809.71 = 556.72/x
3. Step 3: Cross multiply
   1,872.86x = 2,809.71 × 556.72
4. Step 4: Simplify right side
   1,872.86x = 1,564,214.73
5. Step 5: Solve for x
   x = 1,564,214.73/1,872.86
6. Step 6: Final answer
   x = 835.20