Finding the Fourth Proportional to 1,314.16, 1,970.52 and 620.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.16 : 1,970.52 = 620.40 : x
2. Step 2: Convert to fraction form
   1,314.16/1,970.52 = 620.40/x
3. Step 3: Cross multiply
   1,314.16x = 1,970.52 × 620.40
4. Step 4: Simplify right side
   1,314.16x = 1,222,510.61
5. Step 5: Solve for x
   x = 1,222,510.61/1,314.16
6. Step 6: Final answer
   x = 930.26