Finding the Fourth Proportional to 1,012.95, 1,397.94 and 620.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.95 : 1,397.94 = 620.06 : x
2. Step 2: Convert to fraction form
   1,012.95/1,397.94 = 620.06/x
3. Step 3: Cross multiply
   1,012.95x = 1,397.94 × 620.06
4. Step 4: Simplify right side
   1,012.95x = 866,799.69
5. Step 5: Solve for x
   x = 866,799.69/1,012.95
6. Step 6: Final answer
   x = 855.72