Finding the Fourth Proportional to 1,112.45, 1,670.15 and 744.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.45 : 1,670.15 = 744.62 : x
2. Step 2: Convert to fraction form
   1,112.45/1,670.15 = 744.62/x
3. Step 3: Cross multiply
   1,112.45x = 1,670.15 × 744.62
4. Step 4: Simplify right side
   1,112.45x = 1,243,623.37
5. Step 5: Solve for x
   x = 1,243,623.37/1,112.45
6. Step 6: Final answer
   x = 1,117.91