Finding the Fourth Proportional to 2,358.91, 3,538.43 and 878.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,358.91 : 3,538.43 = 878.50 : x
2. Step 2: Convert to fraction form
   2,358.91/3,538.43 = 878.50/x
3. Step 3: Cross multiply
   2,358.91x = 3,538.43 × 878.50
4. Step 4: Simplify right side
   2,358.91x = 3,108,510.76
5. Step 5: Solve for x
   x = 3,108,510.76/2,358.91
6. Step 6: Final answer
   x = 1,317.77