Finding the Fourth Proportional to 1,111.86, 1,666.68 and 917.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.86 : 1,666.68 = 917.46 : x
2. Step 2: Convert to fraction form
   1,111.86/1,666.68 = 917.46/x
3. Step 3: Cross multiply
   1,111.86x = 1,666.68 × 917.46
4. Step 4: Simplify right side
   1,111.86x = 1,529,112.23
5. Step 5: Solve for x
   x = 1,529,112.23/1,111.86
6. Step 6: Final answer
   x = 1,375.27