Finding the Fourth Proportional to 1,009.95, 1,506.42 and 979.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.95 : 1,506.42 = 979.20 : x
2. Step 2: Convert to fraction form
   1,009.95/1,506.42 = 979.20/x
3. Step 3: Cross multiply
   1,009.95x = 1,506.42 × 979.20
4. Step 4: Simplify right side
   1,009.95x = 1,475,086.46
5. Step 5: Solve for x
   x = 1,475,086.46/1,009.95
6. Step 6: Final answer
   x = 1,460.56