Finding the Fourth Proportional to 1,530.21, 2,111.58 and 867.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.21 : 2,111.58 = 867.15 : x
2. Step 2: Convert to fraction form
   1,530.21/2,111.58 = 867.15/x
3. Step 3: Cross multiply
   1,530.21x = 2,111.58 × 867.15
4. Step 4: Simplify right side
   1,530.21x = 1,831,056.60
5. Step 5: Solve for x
   x = 1,831,056.60/1,530.21
6. Step 6: Final answer
   x = 1,196.60