Finding the Fourth Proportional to 1,541.51, 2,127.25 and 878.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,541.51 : 2,127.25 = 878.31 : x
2. Step 2: Convert to fraction form
   1,541.51/2,127.25 = 878.31/x
3. Step 3: Cross multiply
   1,541.51x = 2,127.25 × 878.31
4. Step 4: Simplify right side
   1,541.51x = 1,868,384.95
5. Step 5: Solve for x
   x = 1,868,384.95/1,541.51
6. Step 6: Final answer
   x = 1,212.05