Finding the Fourth Proportional to 1,508.30, 2,081.56 and 878.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,508.30 : 2,081.56 = 878.98 : x
2. Step 2: Convert to fraction form
   1,508.30/2,081.56 = 878.98/x
3. Step 3: Cross multiply
   1,508.30x = 2,081.56 × 878.98
4. Step 4: Simplify right side
   1,508.30x = 1,829,649.61
5. Step 5: Solve for x
   x = 1,829,649.61/1,508.30
6. Step 6: Final answer
   x = 1,213.05