Finding the Fourth Proportional to 1,086.06, 1,498.86 and 620.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.06 : 1,498.86 = 620.34 : x
2. Step 2: Convert to fraction form
   1,086.06/1,498.86 = 620.34/x
3. Step 3: Cross multiply
   1,086.06x = 1,498.86 × 620.34
4. Step 4: Simplify right side
   1,086.06x = 929,802.81
5. Step 5: Solve for x
   x = 929,802.81/1,086.06
6. Step 6: Final answer
   x = 856.12