Finding the Fourth Proportional to 1,111.81, 1,533.34 and 691.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.81 : 1,533.34 = 691.73 : x
2. Step 2: Convert to fraction form
   1,111.81/1,533.34 = 691.73/x
3. Step 3: Cross multiply
   1,111.81x = 1,533.34 × 691.73
4. Step 4: Simplify right side
   1,111.81x = 1,060,657.28
5. Step 5: Solve for x
   x = 1,060,657.28/1,111.81
6. Step 6: Final answer
   x = 953.99