Finding the Fourth Proportional to 2,661,401.70, 3,992,102.55 and 978,156.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661,401.70 : 3,992,102.55 = 978,156.90 : x
2. Step 2: Convert to fraction form
   2,661,401.70/3,992,102.55 = 978,156.90/x
3. Step 3: Cross multiply
   2,661,401.70x = 3,992,102.55 × 978,156.90
4. Step 4: Simplify right side
   2,661,401.70x = 3,904,902,654,790.10
5. Step 5: Solve for x
   x = 3,904,902,654,790.10/2,661,401.70
6. Step 6: Final answer
   x = 1,467,235.35