Finding the Fourth Proportional to 1,852.50, 2,780.12 and 878.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,852.50 : 2,780.12 = 878.61 : x
2. Step 2: Convert to fraction form
   1,852.50/2,780.12 = 878.61/x
3. Step 3: Cross multiply
   1,852.50x = 2,780.12 × 878.61
4. Step 4: Simplify right side
   1,852.50x = 2,442,641.23
5. Step 5: Solve for x
   x = 2,442,641.23/1,852.50
6. Step 6: Final answer
   x = 1,318.56