Finding the Fourth Proportional to 1,068.76, 1,474.89 and 620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.76 : 1,474.89 = 620.72 : x
2. Step 2: Convert to fraction form
   1,068.76/1,474.89 = 620.72/x
3. Step 3: Cross multiply
   1,068.76x = 1,474.89 × 620.72
4. Step 4: Simplify right side
   1,068.76x = 915,486.35
5. Step 5: Solve for x
   x = 915,486.35/1,068.76
6. Step 6: Final answer
   x = 856.59