Finding the Fourth Proportional to 1,111.64, 1,533.04 and 712.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.64 : 1,533.04 = 712.91 : x
2. Step 2: Convert to fraction form
   1,111.64/1,533.04 = 712.91/x
3. Step 3: Cross multiply
   1,111.64x = 1,533.04 × 712.91
4. Step 4: Simplify right side
   1,111.64x = 1,092,921.60
5. Step 5: Solve for x
   x = 1,092,921.60/1,111.64
6. Step 6: Final answer
   x = 983.17