Finding the Fourth Proportional to 1,118.70, 1,543.56 and 670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.70 : 1,543.56 = 670.72 : x
2. Step 2: Convert to fraction form
   1,118.70/1,543.56 = 670.72/x
3. Step 3: Cross multiply
   1,118.70x = 1,543.56 × 670.72
4. Step 4: Simplify right side
   1,118.70x = 1,035,296.56
5. Step 5: Solve for x
   x = 1,035,296.56/1,118.70
6. Step 6: Final answer
   x = 925.45