Finding the Fourth Proportional to 1,111.64, 1,533.42 and 812.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.64 : 1,533.42 = 812.50 : x
2. Step 2: Convert to fraction form
   1,111.64/1,533.42 = 812.50/x
3. Step 3: Cross multiply
   1,111.64x = 1,533.42 × 812.50
4. Step 4: Simplify right side
   1,111.64x = 1,245,903.75
5. Step 5: Solve for x
   x = 1,245,903.75/1,111.64
6. Step 6: Final answer
   x = 1,120.78