Finding the Fourth Proportional to 1,118.37, 1,543.30 and 621.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.37 : 1,543.30 = 621.01 : x
2. Step 2: Convert to fraction form
   1,118.37/1,543.30 = 621.01/x
3. Step 3: Cross multiply
   1,118.37x = 1,543.30 × 621.01
4. Step 4: Simplify right side
   1,118.37x = 958,399.32
5. Step 5: Solve for x
   x = 958,399.32/1,118.37
6. Step 6: Final answer
   x = 856.96