Finding the Fourth Proportional to 1,541.32, 2,126.72 and 878.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,541.32 : 2,126.72 = 878.15 : x
2. Step 2: Convert to fraction form
   1,541.32/2,126.72 = 878.15/x
3. Step 3: Cross multiply
   1,541.32x = 2,126.72 × 878.15
4. Step 4: Simplify right side
   1,541.32x = 1,867,579.17
5. Step 5: Solve for x
   x = 1,867,579.17/1,541.32
6. Step 6: Final answer
   x = 1,211.68