Finding the Fourth Proportional to 1,068.67, 1,474.80 and 620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.67 : 1,474.80 = 620.50 : x
2. Step 2: Convert to fraction form
   1,068.67/1,474.80 = 620.50/x
3. Step 3: Cross multiply
   1,068.67x = 1,474.80 × 620.50
4. Step 4: Simplify right side
   1,068.67x = 915,114.76
5. Step 5: Solve for x
   x = 915,114.76/1,068.67
6. Step 6: Final answer
   x = 856.31