Finding the Fourth Proportional to 1,055.01, 1,581.20 and 507.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.01 : 1,581.20 = 507.05 : x
2. Step 2: Convert to fraction form
   1,055.01/1,581.20 = 507.05/x
3. Step 3: Cross multiply
   1,055.01x = 1,581.20 × 507.05
4. Step 4: Simplify right side
   1,055.01x = 801,747.46
5. Step 5: Solve for x
   x = 801,747.46/1,055.01
6. Step 6: Final answer
   x = 759.94