Finding the Fourth Proportional to 2,661,468.60, 3,991,328.10 and 978,353.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661,468.60 : 3,991,328.10 = 978,353.40 : x
2. Step 2: Convert to fraction form
   2,661,468.60/3,991,328.10 = 978,353.40/x
3. Step 3: Cross multiply
   2,661,468.60x = 3,991,328.10 × 978,353.40
4. Step 4: Simplify right side
   2,661,468.60x = 3,904,929,417,150.54
5. Step 5: Solve for x
   x = 3,904,929,417,150.54/2,661,468.60
6. Step 6: Final answer
   x = 1,467,208.52