Finding the Fourth Proportional to 1,111.11, 1,533.89 and 691.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.11 : 1,533.89 = 691.60 : x
2. Step 2: Convert to fraction form
   1,111.11/1,533.89 = 691.60/x
3. Step 3: Cross multiply
   1,111.11x = 1,533.89 × 691.60
4. Step 4: Simplify right side
   1,111.11x = 1,060,838.32
5. Step 5: Solve for x
   x = 1,060,838.32/1,111.11
6. Step 6: Final answer
   x = 954.76