Finding the Fourth Proportional to 1,111.17, 1,532.28 and 668.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.17 : 1,532.28 = 668.99 : x
2. Step 2: Convert to fraction form
   1,111.17/1,532.28 = 668.99/x
3. Step 3: Cross multiply
   1,111.17x = 1,532.28 × 668.99
4. Step 4: Simplify right side
   1,111.17x = 1,025,072.34
5. Step 5: Solve for x
   x = 1,025,072.34/1,111.17
6. Step 6: Final answer
   x = 922.52