Finding the Fourth Proportional to 2,521.50, 3,781.80 and 878.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.50 : 3,781.80 = 878.06 : x
2. Step 2: Convert to fraction form
   2,521.50/3,781.80 = 878.06/x
3. Step 3: Cross multiply
   2,521.50x = 3,781.80 × 878.06
4. Step 4: Simplify right side
   2,521.50x = 3,320,628.40
5. Step 5: Solve for x
   x = 3,320,628.40/2,521.50
6. Step 6: Final answer
   x = 1,316.93