Finding the Fourth Proportional to 1,111.09, 1,662.90 and 916.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.09 : 1,662.90 = 916.06 : x
2. Step 2: Convert to fraction form
   1,111.09/1,662.90 = 916.06/x
3. Step 3: Cross multiply
   1,111.09x = 1,662.90 × 916.06
4. Step 4: Simplify right side
   1,111.09x = 1,523,316.17
5. Step 5: Solve for x
   x = 1,523,316.17/1,111.09
6. Step 6: Final answer
   x = 1,371.01