Finding the Fourth Proportional to 1,530.71, 2,111.87 and 858.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.71 : 2,111.87 = 858.41 : x
2. Step 2: Convert to fraction form
   1,530.71/2,111.87 = 858.41/x
3. Step 3: Cross multiply
   1,530.71x = 2,111.87 × 858.41
4. Step 4: Simplify right side
   1,530.71x = 1,812,852.80
5. Step 5: Solve for x
   x = 1,812,852.80/1,530.71
6. Step 6: Final answer
   x = 1,184.32