Finding the Fourth Proportional to 1,501.40, 2,071.81 and 872.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.40 : 2,071.81 = 872.10 : x
2. Step 2: Convert to fraction form
   1,501.40/2,071.81 = 872.10/x
3. Step 3: Cross multiply
   1,501.40x = 2,071.81 × 872.10
4. Step 4: Simplify right side
   1,501.40x = 1,806,826.59
5. Step 5: Solve for x
   x = 1,806,826.59/1,501.40
6. Step 6: Final answer
   x = 1,203.43