Finding the Fourth Proportional to 1,343.10, 2,017.05 and 978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.10 : 2,017.05 = 978.30 : x
2. Step 2: Convert to fraction form
   1,343.10/2,017.05 = 978.30/x
3. Step 3: Cross multiply
   1,343.10x = 2,017.05 × 978.30
4. Step 4: Simplify right side
   1,343.10x = 1,973,280.02
5. Step 5: Solve for x
   x = 1,973,280.02/1,343.10
6. Step 6: Final answer
   x = 1,469.20