Finding the Fourth Proportional to 1,507.81, 2,081.00 and 878.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.81 : 2,081.00 = 878.71 : x
2. Step 2: Convert to fraction form
   1,507.81/2,081.00 = 878.71/x
3. Step 3: Cross multiply
   1,507.81x = 2,081.00 × 878.71
4. Step 4: Simplify right side
   1,507.81x = 1,828,580.71
5. Step 5: Solve for x
   x = 1,828,580.71/1,507.81
6. Step 6: Final answer
   x = 1,212.74